Superconductivity Lab
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Publications by topics
Disordered Superconductors			Point Contact Spectroscopy A. Spin polarization measurements B. Multiband Superconductivity C. PCAR methodologies			Colossal Magnetoresistive manganites A. Electron doped manganites B. Spin polarized transport C. Others				Others

Papers on Disordered Superconductors

Phase diagram of a strongly disordered s-wave superconductor, NbN, close to the metal-insulator transition

Madhavi Chand, Garima Saraswat, Anand Kamlapure, Mintu Mondal, Sanjeev Kumar, John Jesudasan, Vivas Bagwe, Lara Benfatto, Vikram Tripathi and Pratap Raychaudhuri

Phys. Rev. B 85, 014508 (2012).

Role of the vortex-core energy on the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN

Mintu Mondal, Sanjeev Kumar, Madhavi Chand, Anand Kamlapure, Garima Saraswat, G. Seibold, L. Benfatto and Pratap Raychaudhuri

Phys. Rev. Lett. 107, 217003 (2011).

Phase fluctuations in a strongly disordered s-wave NbN superconductor close to the metal-insulator transition

Mintu Mondal, Anand Kamlapure, Madhavi Chand, Garima Saraswat, Sanjeev Kumar, John Jesudasan, L. Benfatto, Vikram Tripathi and Pratap Raychaudhuri

Phys. Rev. Lett. 106, 047001 (2011).

(See Research Highlight in Nature India: doi:10.1038/nindia.2011.11)

Phase diagram and upper critical field of homogeneously disordered epitaxial 3-dimensional NbN films

Mintu Mondal, Madhavi Chand, Anand Kamlapure, John Jesudasan, Vivas C. Bagwe, Sanjeev Kumar, Garima Saraswat, Vikram Tripathi and Pratap Raychaudhuri

J. Supercond Nov Magn 24, 341 (2011).

Penetration depth and tunneling studies in very thin epitaxial NbN films

Anand Kamlapure, Mintu Mondal, Madhavi Chand, Archana Mishra, John Jesudasan, Vivas Bagwe, L. Benfatto, Vikram Tripathi and Pratap Raychaudhuri

Appl. Phys. Lett. 96, 072509 (2010).

Temperature dependence of resistivity and Hall coefficient in strongly disordered NbN thin films

Madhavi Chand, Archana Mishra, Y. M. Xiong, Anand Kamlapure, S. P. Chockalingam, John Jesudasan, Vivas Bagwe, Mintu Mondal, P. W. Adams, Vikram Tripathi, and Pratap Raychaudhuri

Phys. Rev. B 80, 134514 (2009).

Vortex matching effect in engineered thin films of NbN

Ajay D. Thakur, Shuuichi Ooi, Subbaiah P. Chockalingam, John Jesudasan, Pratap Raychaudhuri, and Kazuto Hirata

Appl. Phys. Lett. 94, 262501 (2009).

Competing effects of surface phonon softening and quantum size effects on the superconducting properties of nanostructured Pb
Sangita Bose, Charudatta Galande, S P Chockalingam, Rajarshi Banerjee, Pratap Raychaudhuri and Pushan Ayyub

J. Phys.: Condens. Matter 21, 205702 (2009)

Tunneling studies in a homogeneously disordered s-wave superconductor: NbN

S. P. Chockalingam, Madhavi Chand, Anand Kamlapure, John Jesudasan, Archana Mishra, Vikram Tripathi and Pratap Raychaudhuri

Phys. Rev. B 79, 094509 (2009).

Superconducting properties and Hall effect in epitaxial NbN thin films

S. P. Chockalingam, Madhavi Chand, John Jesudasan, Vikram Tripathi and Pratap Raychaudhuri

Phys. Rev. B 77, 214503 (2008)

Non-intrinsic superconductivity in InN epilayers: Role of Indium Oxide

Abdul Kadir, Sourin Mukhopadhyay, Tapas Ganguli, Charudatta Galande, M.R. Gokhale, B.M. Arora, Pratap Raychaudhuri and Arnab Bhattacharya

Solid State Commun. 146, 361 (2008).

Mechanism of the size dependence of superconductivity in nanocrystalline Nb
Sangita Bose, Pratap Raychaudhuri, Rajarshi Banerjee, Parinda Vasa, Pushan Ayyub
Phys. Rev. Lett. 95, 147003 (2005).

Upper critical field in nanostructured Nb: Competing effects of the reduction in density of states and the mean free path

Sangita Bose, Pratap Raychaudhuri, Rajarshi Banerjee, and Pushan Ayyub

Phys. Rev. B 74, 224502 (2006)

Papers related to Point Contact Spectroscopy

A. Spin polarization measurements using Point Contact Andreev Reflection (PCAR)

Study of spin fluctuations in Ni₃Al using point contact Andreev reflection spectroscopy

Sourin Mukhopadhyay, Sudesh Kumar Dhar and Pratap Raychaudhuri

Appl. Phys. Lett. 93, 102502 (2008)

Temperature dependence of transport spin polarization in NdNi₅ measured using Point Contact Andreev reflection

Sourin Mukhopadhyay, Pratap Raychaudhuri, Devang A. Joshi and C. V. Tomy

Phys. Rev B 75, 014504 (2007).

CeMnNi₄: A soft ferromagnet with a high degree of transport spin polarization

Surjeet Singh, Goutam Sheet, Pratap Raychaudhuri and Sudesh Kumar Dhar

Appl. Phys. Lett. 88, 022506 (2006).

Understanding the role of structural disorder on spin polarization in CeMnNi₄ using XAFS

Debdutta Lahiri, S. Khalid, P. Modak, Pratap Raychaudhuri, S. K. Dhar and Surinder M. Sharma

Phys. Rev. B 82, 134424 (2010).

High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12

Goutam Sheet, H. Rosner, S. Wirth, A. Leithe-Jasper, W. Schnelle, U. Burkhardt, J. A. Mydosh, P. Raychaudhuri, and Yu. Grin

Phys. Rev. B 72, 180407 (2005).

Transport spin polarization in SrRuO3 measured through point-contact Andreev reflection
P. Raychaudhuri, A. P. Mackenzie, J. W. Reiner, and M. R. Beasley
Phys. Rev. B 67, 020411 (2003)   

B. Multiband superconductivity in quaternary Borocarbides

Effect of Pt doping on the critical temperature and the upper critical field in YNi2−xPtxB2C for doping range 0<x<0.2

Sourin Mukhopadhyay, Goutam Sheet, A. K. Nigam, Pratap Raychaudhuri, and H. Takeya

Phys. Rev. B 79, 132505 (2009)

Magnetic-field dependence of superconducting energy gaps in YNi₂B₂C: Evidence of multiband superconductivity
S. Mukhopadhyay, Goutam Sheet, P Raychaudhuri, H Takeya
Phys. Rev. B 72, 014545 (2005)

Evidence of gap anisotropy in superconducting YNi2B2C using directional point contact spectroscopy
P Raychaudhuri, D Jaiswal-Nagar, Goutam Sheet, S Ramakrishnan and H Takeya,
Phys. Rev. Lett. 93, 156802 (2004)   

C. PCAR methodologies
Anomalous structures in point contact andreev reflection spectrum
Goutam Sheet, Sourin Mukhopadhyay, Swati Soman, Pratap Raychaudhuri
Physica B 359-361C, 491 (2005).

Role of critical current on the point-contact Andreev reflection spectra between a normal metal and a superconductor
Goutam Sheet, S. Mukhopadhyay, and P. Raychaudhuri
Phys. Rev. B 69, 134507 (2004)   

Comment on "Spectroscopic Evidence for Multiple Order Parameters in the Heavy Fermion Superconductor CeCoIn₅"

Goutam Sheet and Pratap Raychaudhuri

Phys. Rev. Lett. 96, 259701 (2006) 

Papers Related to Colossal Magnetoresistive Manganites

A. Electron Doped Manganites

Correlation between effects of electric current and magnetic field on transport properties of electron-doped manganite La_0.7Ce_0.3MnO₃ thin films
Kavita Bajaj, John Jesudasan, Vivas Bagwe, D C Kothari and Pratap Raychaudhuri
J. Phys.: Condens. Matter 19, 382202 (2007).Fast-Track communication

Electroresistive effects in electron doped manganite La_0.7Ce_0.3MnO₃ thin films
Kavita Bajaj, John Jesudasan, Vivas Bagwe, D C Kothari and P Raychaudhuri
J. Phys.: Condens. Matter 19, 046208 (2007).

Bandwidth control effects in electron doped manganite La_0.7-xY_xCe_0.3MnO₃ thin films

Kavita Bajaj, Vivas Bagwe, John Jesudasan, Pratap Raychaudhuri

Solid State Commun. 138, 549 (2006).

Photoemission and x-ray absorption spectroscopy study of electron-doped colossal magnetoresistive manganite La0.7Ce0.3MnO3 films
S. W. Han et al.
Phys. Rev. B 69, 104406 (2004)   

Phase diagram and Hall effect of the electron doped manganite La1 - xCexMnO3
P. Raychaudhuri, C. Mitra, P. D. A. Mann, and S. Wirth
J. Appl. Phys. 93, 8328 (2003)  

Direct observation of electron doping in La0.7Ce0.3MnO3 using x-ray absorption spectroscopy
C. Mitra, Z. Hu, P. Raychaudhuri, S. Wirth, S. I. Csiszar, H. H. Hsieh, H.-J. Lin, C. T. Chen, and L. H. Tjeng
Phys. Rev. B 67, 092404 (2003)   

Observation of Minority Spin Character of the New Electron Doped Manganite La0.7Ce0.3MnO3 from Tunneling Magnetoresistance
C. Mitra, P. Raychaudhuri, K. Dörr, K.-H. Müller, L. Schultz, P. M. Oppeneer, and S. Wirth
Phys. Rev. Lett. 90, 017202 (2003)   

Magnetotransport properties of a room temperature rectifying tunnel junction made of electron and hole doped manganites
C. Mitra, G. Köbernik, K. Dörr, K.-H. Müller, L. Schultz, P. Raychaudhuri, R. Pinto, and E. Wieser
J. Appl. Phys. 91, 7715 (2002)  

(conference) Formation of epitaxial and polycrystalline films of the electron doped system La_1-xCe_xMnO₃ through pulsed laser deposition
C. Mitra, P. Raychaudhuri, S. K. Dhar, A. K. Nigam and R. Pinto
Journal of Magnetism and Magnetic Materials, 226-230, 809 (2001)   

p--n diode with hole- and electron-doped lanthanum manganites
C. Mitra, P. Raychaudhuri, G. Köbernik, K. Dörr, K.-H. Müller, L. Schultz, and R. Pinto
Appl. Phys. Lett. 79, 2408 (2001)  

Growth of epitaxial and polycrystalline thin films of the electron doped system La_1-xCe_xMnO₃ through pulsed laser deposition
C. Mitra, P. Raychaudhuri, J. John, S. K. Dhar, A. K. Nigam, and R. Pinto
J. Appl. Phys. 89, 524 (2001)  

Transport and magnetic properties of laser ablated La0.7Ce0.3MnO3 films on LaAlO3
P. Raychaudhuri, S. Mukherjee, A. K. Nigam, J. John, U. D. Vaisnav, R. Pinto, and P. Mandal
J. Appl. Phys. 86, 5718 (1999)   

(conference) Magnetic and transport properties of the electron doped layered manganite La_2.3-xY_xCa_0.7Mn₂O₇
P. Raychaudhuri, A. K. Nigam, C. Mitra, S. K. Dhar and R. Pinto
Physica B: Condensed Matter, 259-261, 835 (1999)

The metal - insulator transition and ferromagnetism in the electron-doped layered manganites ( x = 0, 0.3, 0.5)
P Raychaudhuri, C Mitra, A Paramekanti, R Pinto, A K Nigam and S K Dhar
J. Phys.: Condens. Matter 10, L191 (1998)  

B. Spin polarised Transport in Granular Manganites

Anomalous bias dependence of tunnel magnetoresistance in a magnetic tunnel junction
Soumik Mukhopadhyay, I. Das, S. P. Pai, and P. Raychaudhuri
Appl. Phys. Lett. 86, 152108 (2005)

Enhanced room-temperature magnetoresistance in La0.7Sr0.3MnO3-glass composites
S. Gupta, R. Ranjit, C. Mitra, P. Raychaudhuri, and R. Pinto
Appl. Phys. Lett. 78, 362 (2001) 

Spin-polarized tunneling in the half-metallic ferromagnets La[sub 0.7 - x]Ho[sub x]Sr[sub 0.3]MnO[sub 3] (x = 0 and 0.15): Experiment and theory
P. Raychaudhuri, K. Sheshadri, P. Taneja, S. Bandyopadhyay, P. Ayyub, A. K. Nigam, R. Pinto, Sujeet Chaudhary, and S. B. Roy
Phys. Rev. B 59, 13919 (1999) 

A phenomenological model for magnetoresistance in granular polycrystalline colossal magnetoresistive materials: The role of spin polarized tunneling at the grain boundaries
P. Raychaudhuri, T. K. Nath, A. K. Nigam, and R. Pinto
J. Appl. Phys. 84, 2048 (1998) 

C. Others

Low-temperature transport anomaly in the magnetoresistive compound (La0.5Pr0.2)Ba0.3MnO3
D. S. Rana, J. H. Markna, R. N. Parmar, D. G. Kuberkar, P. Raychaudhuri, J. John, and S. K. Malik
Phys. Rev. B 71, 212404 (2005)

Evolution of transport and magnetic properties with dysprosium doping in La_0.7-xDy_xSr_0.3MnO₃ (x=0–0.4) 
C. Mitra, P. Raychaudhuri, S. K. Dhar, A. K. Nigam, R. Pinto and S. M. Pattalwar
Journal of Magnetism and Magnetic Materials, 192, 130 (1999)  

The effect of holmium doping on the magnetic and transport properties of
P Raychaudhuri, T K Nath, P Sinha, C Mitra, A K Nigam, S K Dhar and R Pinto
J. Phys.: Condens. Matter 9, 10919 (1997) 

Other Papers

Pulsed laser deposition of NdNiO₃ thin films
Davinder Kaur, J. Jesudasan and P. Raychaudhuri

Solid State Commun, 136, 369 (2005).

Size induced metal–insulator transition in nanostructured niobium thin films: intra-granular and inter-granular contributions
Sangita Bose, Rajarshi Banerjee, Arda Genc, Pratap Raychaudhuri, Hamish L Fraser and Pushan Ayyub
J. Phys.: Condens. Matter 18, 4553 (2006).

Sensitivity to Disorder of the Metallic State in the Ruthenates
L. Capogna et al.
Phys. Rev. Lett. 88, 076602 (2002) 

Peak-effect, a new phenomenon observed at microwave frequencies in high T_c superconductor thin films
A. R. Bhangale, T. Banerjee, P. Raychaudhuri, S. P. Pai, J. John, S. S. Bhagwat, V. C. Bagwe, V. S. Shirodkar and R. Pinto
Physica C: Superconductivity, 382, 386 (2002)

Peak effect in a superconducting DyBa2Cu3O7-delta film at microwave frequencies
A. R. Bhangale, P. Raychaudhuri, S. Sarkar, T. Banerjee, S. S. Bhagwat, V. S. Shirodkar, and R. Pinto
Phys. Rev. B 63, 180502 (2001)  

Critical behavior in La[sub 0.5]Sr[sub 0.5]CoO[sub 3]
S. Mukherjee, P. Raychaudhuri, and A. K. Nigam
Phys. Rev. B 61, 8651 (2000)  

(conference)  Peak effect in laser ablated DyBa[sub 2]Cu[sub 3]O[sub 7-delta] films at microwave frequencies at subcritical currents
A. R. Bhangale, P. Raychaudhuri, T. Banerjee, R. Pinto, and V. S. Shirodkar
J. Appl. Phys. 89, 7490 (2001) 

Radio-frequency magnetoabsorption in YBCO - Ag and BSCCO superconductors: the cross-over between two-level and one-level critical state models
Pratap Raychaudhuri
Supercond. Sci. Technol. 9,  447 (1996)