Dr. Krushna R. Mavani

                Discipline of Physics 

                Metallurgical Engineering and Materials Science

                Indian Institute of Technology Indore

(UPDATED in June 2017)

                             Research Areas           Publications                 Project                    Photo Gallery         

                                                 

Dr. Krushna R. Mavani                    
Associate Professor
Discipline of Physics
Metallurgical Engineering and Materials Science
Indian Institute of Technology Indore
Simrol, Khandwa Road
Indore 453 552

Email: krushna@iiti.ac.in
Phone: +91 731 2438 923


  Employment Hisotry:
  • Associate Professor, IIT Indore, Since September 2013.
  • Assistant Professor, IIT Indore, From July 2009 to August 2013.
  • WPI postdoctoral Researcher at Kyoto University, Japan, from Jan. 2007 to May 2009.
  • Postdoctoral researcher at Osaka University, Japan, from Dec. 2005 to Dec. 2006. 
  • Postdoctoral researcher at Tata Institute of Fundamental Research, Mumbai, from Oct. 2003 to Nov. 2005.
  • Junior Research Fellow in a research project of IUAC (formeterly NSC) New Delhi, from Oct. 2000 to Sept. 2003.

CSIR, UGC NET-JRF qualified and INSPIRE fellows are welcome to apply for Ph.D. , send your CV to krushna@iiti.ac.in 


  Group Members:                                                                                           


Harisankar S.
Ph.D. Scholar
Mr. Harisankar joined in July 2014.

Theme of his research work:

"Terahertz Spectroscopic Investigations on Strongly Correlated Properties of Thin Film Oxides"

He is M.Tech. (Optoelectronics and Laser Technology) from CUSAT Kochi Kerela, M.Sc. (Physics) and B.Sc. from Govt. College Kottayam.


Kavita Soni
Ph.D. Scholar
Ms. Kavita soni joined in July 2014
Theme of her research work:

"Structure-Property Correlations in Thin Films and Layered Oxides"

She is M.Tech. (Laser Science and Applications) from School of Physics, Indore, M.Sc. (Physics) from School of Physics, Indore and B.Sc. (Computer Science) from Devi Ahilya Vishwavidyalaya (DAVV) Indore.


Ankit Soni
Ph.D. Scholar
Mr Ankit Soni joined in December 2014.
Theme of his research work:

"Strain-controlled Properties and Effects of Chemical Doping in Thin Film Oxides"

He is M.Tech. (Laser Science and Applications) from School of Physics, Indore, M.Sc. (Physics) from School of Physics, Indore and B.Sc. (Computer Science) from Devi Ahilya Vishwavidyalaya (DAVV) Indore.


Ekta Yadav
M.Sc. student

Ms Ekta Yadav is pursuing her M.Sc. course in physics (Batch 2016-2018).

Theme of her research work:

"Phase-transitions in Rare-earth Nickelate Thin Films"

Reena Yadav
M.Sc. student
Ms Reena Yadav is pursuing her M.Sc. course in physics (Batch 2016-2018).

Theme of her research work:

"Doping induced effects on the properties of ZnO thin films grown by pulsed laser deposition"


Alumni:     
     

Dr. Fozia Aziz 

Dr. Fozia Aziz, Completed her Ph.D. (2010-2014).


Ph.D. Thesis title: "Correlations of Structure and Magnetism in Perovskite Thin Films", 2014
       She is the first Ph.D. student of Discipline of Physics, IIT Indore.
   
Dr. Mahesh Chandra
Dr. Mahesh Chandra completed his Ph.D. (2010-2015).


Ph.D. Thesis title: "Phase Transitions in NdNiO3 Thin Films and Multilayers: Influence of Strain and Doping ", 2015.
Presently Dr. Mahesh Chandra is a 'National Postdoctoral Fellow (NPDF)' at IIT Delhi.
               

Research Areas:

  

The materials with metal-insulator transition are studied extensively over the years due to variery of applications.

The metal-insulator transtions can be  observed by varying  parameters like temperature, pressure, magnetic field or doping.

We study the metal-insulator transitions and related phenomena in thin film oxides.

 

The Figure shows metal-insulator transition with varying temperature in  RNiO3 (R=rare eath metal ion) film.




There are a number of applications of magnetic materials. We study the correlation of structure, electrical and magnetic properties in functional oxide thin films.

By modifying the strain, the structure and the doping, we modify the magnetic properties of materials.


The figure shows magnetic domain patterns of BaFeO3 thin film recorded by Magnetic Force Microscopy at IIT Indore, (a) as-deposited, (b) irradiated. The inset figures show Fast Fourier Transformation of pattern.

The optical techniques are now far advanced and efficient as a result of the development in field of lasers. The field of THz science is emerging up for about last 20 years. Several table-top spectroscopic techniques are established with the use of femtosecond lasers

a) THz-emission spectroscopy: For studying the photoinduced effect and photo-control of physical properties of solid materials. The THz-emission may take place due to ultra-fast charge carriers, demagnetization or depolarization inside the material. It has recently been identified that THz-emission from multiferroic materials is directly originated from the memory parameter of these materials. This property can lead to the non-destructive ultrafast optical control of the electric/magnetic memory. Also, THz-emission spectroscopy can be used for exploring the THz-radiation sources for commercial applications.

b) THz time-domain spectroscopy: For understanding the low-energy (4 – 40 meV) dynamics (via calculation of complex optical specta) in solid electronic and magnetic materials. This is a non-contact method which has several advantages over contact method and can be used to measure conductivity in thin films, nano materials and nano tubes.

Apart from the abovementioned two spectroscopic THz techniques, THz-imaging is another advanced tool for bio-sciences and medical aplliations. Also, there are various other THz techniques available in different laboratories for fundamental study and various applications.

We have initiated research using THz time-domain spectroscopy in collaborations within country and abroad. Presently we study low-energy dynamics in thin films of functional oxides.

Project:

DST project titled "Investigations on Structural, Magnetic and Ferroelectric Correlations in RMnO3 thin films"

Academics (2009-2017):

Ph.D. students trained:

1.  Dr. Fozia Aziz (2010 to 2014)
          2. Dr. Mahesh Chandra (2010-2015)

Courses taken (2009-2017):

Electronics (Postgraduate Course)
Statistical Mechanics (Postgraduate Course)
Mathematical Methods (Postgraduate Course)
Classical Mechanics (Postgraduate Course)
Advanced Materials (Ph.D. elective course)

Electrodynamics (Undergraduate course)
Modern Physics (Undergraduate course)

Significant contribution in development of B. Tech. Physics laboratory at IIT Indore.

Community Service:

Reviewed manuscripts for the following journals:

Publictaions:

a)  From IIT Indore:

1.       “Induced metal-insulator transition and temperature independent charge transport in NdNiO3-d thin films”

Mahesh Chandra, Sarmistha Das, Fozia Aziz, Manoj Prajapat, K.R. Mavani

Journal of Alloys and Compounds 696 (2017) 423-427

2.       “Structural and metamagnetic transitions in thin films of Ce doped Pr0.5Ca0.5MnO3 manganites”

Fozia Aziz, Mahesh Chandra, Sarmistha Das, Manoj Prajapat, K. R. Mavani

Thin Solid Films 615, 338 (2016).

3.       “Large effects of epitaxial tensile strain on electrical transport of Mn-doped NdNiO3  thin films”

Mahesh Chandra, Sarmistha Das, Fozia Aziz, Shivendra Tripathi, K.R.Mavani

Solid State Communications 219, 16 (2015).

4.       “Ion Irradiation Induced Relaxation of Tensile Strain and Change in Directionality of Magnetic Domains in BaFeO3-δ Thin Films”

Fozia Aziz, Mahesh Chandra, Sarmistha Das, Manoj Prajapat, K. Asokan, K. R. Mavani.

Europhysics Letters 110, 47011 (2015).

5.       “Effects of Ti-doping on evolution of coexisting magnetic phases in BaFeO3–δ thin films at room temperature”

Fozia Aziz, Mahesh Chandra, Amit Khare, Parul Pandey, K. R. Mavani

J. Appl. Phys. 115, 223907 (2014)

6.       “Contrasting effects of doping on insulating and metallic states of NdNi1-xMnxO3 thin

Films”

Mahesh Chandra, Fozia Aziz, Shivendra Tripathi, Rakesh Rana, D. S. Rana, and K. R. Mavani

J. Appl. Phys. 115, 093701 (2014)

7.       “Surface morphology, ferromagnetic domains and magnetic anisotropy in BaFeO3-δ thin films: Correlated structure and magnetism”

Fozia Aziz, Parul Pandey, Mahesh Chandra, Amit Khare, D. S. Rana, K. R. Mavani

J. Magn. Mag. Mater. 356, 98 (2014)

8.       “Competing Effects of Mn-Doping and Strain on Electrical Transport of NdNi1-xMnxO3 (0 ≤ x ≤ 0.10) Thin Films”
 Mahesh Chandra, Rakesh Rana, Fozia Aziz, Amit Khare, D. S. Rana and K. R. Mavani
  J. Phys. D: Appl. Phys. 46, 415305 (2013)

9.       Charge Transport in NdNiO3 Thin Films: Effects of Mn-doping versus Tensile Strain

Mahesh Chandra, Fozia Aziz, Rakesh Rana, Ravikiran Late, D.  S. Rana, K. R. Mavani

AIP Conf. Proc. 1591 (2014) pp. 1375

10.    “Anisotropy-induced crossover from Drude conductivity to charge-density-wave excitations in a stripe-type charge-ordered manganite”

 R. Rana, P. Pandey, D. S. Rana, K. R. Mavani, I. Kawayama, H. Murakami, M. Tonouchi,

 Phys. Rev. B 87, 224421 (2013) (DOI: 10.1103/PhysRevB.87.224421)

11.   “Contrasting effects of compressive and tensile strain and doping-induced opening of charge-transfer gap in NdNi0.90Mn0.10O3 thin films”

Mahesh Chandra, Amit Khare, Fozia Aziz, Rakesh Rana, D. S. Rana, and K. R. Mavani,

AIP Conf. Proc. 1512, (2013) pp. 986-987

12.    “Spin dynamics in Pr1‑xCexCa0.5MnO3 system studied by muon spin relaxation”

K. R. Mavani, A. D. Hillier, P. L. Paulose, W. A. Kockelmann , D. T. Adroja,

J. Appl. Phys. 112, Issue 7 (2012), 073911

13.    “Charge density wave excitations in stripe-type charge ordered Pr0.5Sr0.5MnO3 manganite”

Rakesh Rana, D. S. Rana  K. R. Mavani, I. Kawayama, H. Murakami, M. Tonouchi,

Appl. Phys. Lett. 101(2012) 252401

 

14.   “Sharp metamagnetic and correlated electronic transitions in manganites: A systematic effect of cation disorder”

K. R. Mavani, Fozia Aziz, Mahesh Chandra and P. L. Poulose

AIP Conf. Proc. 1447, (2011) 141-142;

b)  Publications during postdoctoral tenure and Ph.D. course:

 

15.   “Understanding the nature of ultrafast polarization dynamics of the ferroelectric memory in the multiferroic BiFeO3 thin films”

D. S. Rana, I. Kawayama, K. R. Mavani, K. Takahashi, H. Murakami, M. Tonouchi.

Advanced Materials 21 (2009) 2881 (Impace factor ~8.5]

16.   Effects of Disorder and scaling of optical conductivity in half-doped manganites Nd0.5Ca0.5MnO3 and Nd0.5Ca0.48Ba0.02MnO3 thin films as observed by Terahertz time-domain spectroscopy.

K. R. Mavani, M. Nagai, H. Yada, K. Tanaka, D. S. Rana, I. Kawayama, M. Tonouchi.

Applied Physics Letters 93 (2008) 231908

17.    “Effects of cation disorder on terahertz emission from half-doped manganite thin films”

K. R. Mavani, D. S. Rana, K. Takahashi, I. Kawayama, H. Murakami, M. Tonouchi.

Europhysics Letters 81 (2008) 17009

18.   “Magnetic-field cycling induced anomalous irreversibility in resistivity of charge‑ordered manganites”

K. R. Mavani and P. L. Paulose.

Europhysics Letters 78 (2007) 37004

19.   “200 MeV Ag+15 ion irradiation induced columnar defects and enhanced critical current density of La-2125 type superconducting thin films”

            K. R. Mavani, D. S. Rana, S. Rayaprol, R. N. Parmar, D. G. Kuberkar, Ravi Kumar, Masayoshi Tonouchi, J. John, R. Nagarajan.

            Solid State Communications 142 (2007) 462.

             

20.   Implications of Phase-segregation on the structure, magnetism and THz-emission of multiferroic Bi(Fe1-xMnx)O3 (0≤x≤0.5) thin films

D.S. Rana, I. Kawayama, K. Takahashi, K.R. Mavani, H. Murakami, M. Tonouchi, T. Yanagida, H. Tanaka and T. Kawai

Europhysics Letters 84 (2008) 67016

21.   “Structural dependence of terahertz radiation from multiferroic BiFeO3 thin films”

D. S. Rana, K. Takahashi, K. R. Mavani, I. Kawayama, H. Murakami, M. Tonouchi

Physical Review B 77 (2008) 24105

22.    “Visualization of photoassisted  polarization switching and its consequences in BiFeO3 thin films probed by terahertz radiation

D. S. Rana, K. Takahashi, K. R. Mavani, I. Kawayama, H. Murakami, M. Tonouchi.

Applied Physics Letters 91 (2007) 31909

23.    “Thickness dependence of structure and magnetization of BiFeO3 films on (LaAlO3)0.3(Sr2AlTaO6)0.7 (001) substrate”

D. S. Rana, K. Takahashi, K. R. Mavani, I. Kawayama, H. Murakami, M. Tonouchi, T. Yanagida, H. Tanaka and T. Kawai.

Physical Review B (Rapid communication) 75 (2007) 60405.

24.   “Influence of Ce substitution on structure, magnetism and transport in Pr1‑xCexCa0.5MnO3 (0.03≤x≤0.20) system: from metamagnetism to a spin-glass state”

            K. R. Mavani and P. L. Paulose

            Physical Review B 72 (2005) 104421.

             

25.   “Effects of cation disorder and size on metamagnetism in A‑site substituted Pr0.5Ca0.5MnO3 system”

            K. R. Mavani and P. L. Paulose.

Applied Physics Letters 86 (2005) 162504.

26.    “Growth parameters dependent magnetoresistance in (La0.5Pr0.2)Ba0.3MnO3 thin films”

            K. R. Mavani, D. S. Rana, S. K. Malik, J. H. Markna, R. N. Parmar, D. G. Kuberkar, P. Misra, L. M. Kukreja, D. C. Kundaliya.

            Journal of Applied Physics (communication) 98 (2005) 86111.

27.    “Magnetic and electronic transitions in charge-ordered Nd0.50Ca0.47Ba0.03MnO3 manganite”

K. R. Mavani and P. L. Paulose.

Journal of Magnetism and Magnetic Materials 310 (2007)  e190

28.   A comparative study on metamagnetic transitions in half-doped Pr0.45La0.05Ca0.5MnO3 and Pr0.45Gd0.05Ca0.5MnO3 manganites”

            K. R. Mavani and P. L. Paulose

            Physica B 378 (2006) 504.

             

29.   “Effect of size disorder on the magnetic and transport properties of the (LaR)0.55(CaSr)0.45MnO3 compounds”

D. S. Rana, K. R. Mavani, D. C. Kundaliya, D. G. Kuberkar and S. K. Malik

Physica B 378 (2006) 501.

30.   “Effects of cation size disorder and lattice distortion on metamagnetism in phase‑separated manganites”

K. R. Mavani and P. L. Paulose.

Solid State Communications 135 (2005) 183.

31.   “Effect of Eu and Sr substitution on the electronic and magnetic properties of La0.7Ca0.3MnO3 manganite”
D.S. Rana, C.M. Thaker, K.R. Mavani, D.G. Kuberkar and S.K. Malik.
Hyperfine Interaction 160 (2005) 193.

 

32.    “Large low temperature magnetoresistance in (La0.7‑2xEux)(Ca0.3Srx)MnO3 (0.05≤x≤0.15) compounds”
D.S. Rana, C.M. Thaker, K. R. Mavani, D.G. Kuberkar and S.K. Malik.

Solid State Communications 133 (2005) 505.

33.    Studies on Zn doped tetragonal La1.5Nd0.5CaBa2Cu5O7-z superconducting system”

K. R. Mavani, D.S. Rana, R. Nagarajan and D.G. Kuberkar.

Physica C 403 (2004) 304.

34.   “Effect on superconductivity of Sc and Ti doping in DyBa2Cu3O7-z

K. R. Mavani, D.S.Rana, R.Nagarajan, D.G.Kuberkar.

Journal of Magnetism and Magnetic Materials 272-276 (2004) E1067.

35.    “Doppler broadening measurements of the electron-positron annihilation radiation in La0.7Y0.3Ca0.5Ba1.5Cu3Oz superconductor”

M. Chakrabarti, K. R. Mavani, S. Chattopadhyay, A. Sarkar, D. Sanyal.

Physics Letters A 329 (2004) 231.

36.   “Disorder effects in (LaTb)0.5(CaSr)0.5MnO3 compounds”

D.S. Rana, K.R. Mavani, C.M. Thaker, D.G. Kuberkar, D.C. Kundaliya, S.K. Malik.

Journal of Applied Physics 95 (2004) 7097.

37.   “Electronic transport, magnetism and magnetoresistance of (La0.7‑3xTbx)(Ca0.3Sr2x)MnO3 (0.025 ≤ x ≤ 0.125) compounds”

D.S.Rana, K. R. Mavani, C. M. Thaker, D. G. Kuberkar, D. C. Kundaliya, S. K. Malik.

Journal of Magnetism and Magnetic Materials 271 (2004) 215.

38.    Magnetism and electronic transport of La0.7-2xEuxCa0.3SrxMnO3: Effect of simultaneous size disorder and carrier density”

D. S. Rana, C.M Thaker, K. R. Mavani, D.G. Kuberkar, Darshan C. Kundaliya and S.K. Malik.

Journal of Applied Physics 95 (2004) 4934.

39.   “Ferromagnetism and charge-ordering in (LaR)0.50(CaSr)0.50MnO3 (R=Nd,Eu,Tb) compounds”

D.G. Kuberkar, D.S. Rana. K. R. Mavani, C.M. Thaker, Darshan C. Kundaliya and S.K. Malik.

Journal of Mangetism and Magnetic Materials 272-276, 1823 (2004).

40.    Study of 200 MeV Ag ion irradiation effects on oxygen stoichiometry of La-2125 type superconducting thin films using ERDA

K. R. Mavani, S.Rayaprol, D.S.Rana, C.M.Thaker, D.G.Kuberkar, J.John, R.Pinto, S.V.S.Nageswara Rao, S.A.Khan, S.K.Srivastava, A. Dogra, R. Kumar, D.K.Avasthi.

Radiation Measurements 36, 733 (2003).

41.    “Studies on La2-xPrxCayBa2Cu4+yOz (x = 0.1 - 0.5, y = 2x) type mixed oxide superconductors”

S. Rayaprol, K. R. Mavani, D. S. Rana, C. M. Thaker, Manglesh Dixit, Shovit Bhattacharya, D. G. Kuberkar.

Solid State Communications 128, 97 (2003).

42.   Effect of Mo substitution on the superconductivity, flux pinning and critical currents of La1.5Nd0.5Ca1Ba2Cu5Oz

S. Rayaprol, Krushna Mavani, C.M. Thaker, D.S. Rana, R.G. Kulkarni, D.G.Kuberkar, Darshan C. Kundaliya and S.K. Mailk.

Physica C 391, 237 (2003).

43.   Effect of bandwidth and size disorder on the electronic and magnetic properties of LaMnO3 perovskite”

C.M. Thaker, D.S. Rana, Krushna Mavani, S. Rayaprol, M. Shasrabudhe, S.I. Patil, N.A. Kulakarni and D.G. Kuberkar.

Indian Journal of Engineering and Materials Science 10, 324 (2003).

44.   Structural Investigations of La-2125 mixed oxide superconducting system”

S. Rayaprol, Krushna Mavani, D.S.Rana, C.M.Thaker, R.S.Thampi, D.G.Kuberkar, R.G.Kulkarni, S.K.Malik.

Journal of Superconductivity 15, 211 (2002).

45.   “Structural studies and Tc dependence in  La2-xDyxBa2CayCu4+yOz type mixed oxide superconductors”

S.Rayaprol, Krushna Mavani, C.M. Thaker, D.S. Rana, Nilesh A. Kulkarni, Keka Chakravorty, S.K.Paranjape, M. Ramanadham and D.G. Kuberkar.

Pramana - Journal of Physics 58, 877 (2002).

46.   “Effect of Pr-Ca substitution on the transport and magnetic behavior of LaMnO3 perovskite”

C. M. Thaker, S. Rayaprol, Krushna Mavani, D. S. Rana, M. Sahasrabudhe, S. I. Patil, D.G. Kuberkar.

Pramana - Journal of Physics 58, 1035 (2002)

47.   “Superconducting and Hole Concentration of La2-xRxBa2CayCu4+yOz; R = Nd, Gd; y = 2x system”,

D.G.Kuberkar, R.S.Thampi, N.A.Shah, Krushna Mavani, S.Rayaprol, S.K.Malik, W.B.Yelon, R.G.Kulkarni.

Journal of Applied Physics 89, 7657 (2001).

48.   “Effect of Sr-substitution on the restitution of superconductivity in Pr-substitution at rare earth and Ba-site in EuBa2Cu3Oz

R.S.Thampi, S.Rayaprol, Krushna Mavani, D. G. Kuberkar, M.R.Gonal, Ram Prasad, R.G.Kulkarni

Physica C 355, 23  (2001).

Publications in proceedings (Peer reviewed and published during PH.D. and postdoctoral tenures):

49.   “Multiple Sharp Metamagnetic Transitions in Charge-Ordered Pr0.47RE0.03Ca0.5MnO3 (RE = La, Ce, Nd) Manganites”

K. R. Mavani and P. L. Paulose

Solid State Physics (India), vol. 48 (2005).

50.   “Electrical and Magnetic Properties of (La0.25Nd0.25)(Ca0.25Sr0.25)MnO3 Manganite”

D. S. Rana, C. M. Thaker, K. R. Mavani, D. G. Kuberkar and S. K. Malik

Solid State Physics (India) 46, 2003.

51.   “Effect of size disorder on electrical and magnetotransport properties of La0.5Pr0.2Ba0.3MnO3 thin films: a comparison with La0.7­Ca0.3MnO3

K. R. Mavani, D. S. Rana, C. M. Thaker, D. G. Kuberkar, P. Misra, L. M. Kukreja, S. K. Malik

Proceedings of DAE-BRNS Topical Meeting on PLD of thin films (November 26, 2003)

52.   Cation Size Mismatch Dependent Structural and Transport Properties of Sr and Ba Doped La0.5Pr0.2Ca0.3MnO3

D.S.Rana, C.M.Thaker. Krushna Mavani, S.Rayaprol, D.G.Kuberkar,

Solid State Physics (India), Vol. 45 (2002)

53.   Revival of Tc by Ca doping at Y site in YBa2(Cu1-xZnx)3O7-d system”

Krushna Mavani, S.Rayaprol, D.S.Rana, C.M.Thaker, S.K.Paghdar, R. Nagarajan, Nilesh A. Kulkarni, D.G.Kuberkar.

Solid State Physics (India) 44, 341 (2001)

54.    “Anomalous behavior in Y0.8Mo0.2MnO3 system”

C.M. Thaker, D.S. Rana, Krushna Mavani, S. Rayaprol, M. Sahasrabudhe, S. I. Patil, Nilesh A. Kulkarni and D.G. Kuberkar.

Solid State Physics (India) 44, 379 (2001)

55.   “Effect of Mo-substitution on the superconductivity in La-2125 perovskite system”

S. Rayaprol, Krushna Mavani, R.S.Thampi, C.M.Thaker, D.G.Kuberkar, R.G.Kulkarni.

        Solid State Physics (India) 43, 384 (2000)