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

Vortex State Studies

Instrumentation

(STM)

Others

 

Instrumentation

 

A 350 mK, 9 T scanning tunneling microscope for the study of superconducting thin films on insulating substrates and single crystals

Anand Kamlapure, Garima Saraswat, Somesh Chandra Ganguli, Vivas Bagwe, Pratap Raychaudhuri, and Subash P. Pai

Review of Scientific Instruments 84, 123905 (2013). pdf

 

Papers on Vortex State Studies

Dynamic transition from Mott-like to metal-like state of the vortex lattice in a superconducting film with a periodic array of holes

Indranil Roy, Prashant Chauhan, Harkirat Singh, Sanjeev Kumar, John Jesudasan, Pradnya Parab, Rajdeep Sensarma, Sangita Bose, Pratap Raychaudhuri

Phys. Rev. B 95, 054513 (2017). pdf

 

Disorder-induced two-step melting of vortex matter in Co-intercalated NbSe2 single crystals

Somesh Chandra Ganguli, Harkirat Singh, Indranil Roy, Vivas Bagwe, Dibyendu Bala, Arumugam Thamizhavel, and Pratap Raychaudhuri

Phys. Rev. B 93, 144503 (2016). pdf

 

Orientational coupling between the vortex lattice and the crystalline lattice in a weakly pinned Co0.0075NbSe2 single crystal

Somesh Chandra Ganguli, Harkirat Singh, Rini Ganguly, Vivas Bagwe, Arumugam Thamizhavel and Pratap Raychaudhuri

J. Phys.: Condens. Matter 28, 165701 (2016).pdf


Disordering of the vortex lattice through successive destruction of positional and orientational order in a weakly pinned Co0.0075NbSe2 single crystal

Somesh Chandra Ganguli, Harkirat Singh, Garima Saraswat, Rini Ganguly, Vivas Bagwe, Parasharam Shirage, Arumugam Thamizhavel & Pratap Raychaudhuri 

Scientific Reports 5, 10613 (2015). pdf

 

Origin of matching effect in anti-dot array of superconducting NbN thin films

Sanjeev Kumar, Chandan Kumar, John Jesudasan, Vivas Bagwe, Pradnya Parab, Pratap Raychaudhuri and Sangita Bose

Supercond. Sci. Technol. 28, 055007 (2015) pdf

 

A two-coil mutual inductance technique to study matching effect in disordered NbN thin films

Sanjeev Kumar, Chandan Kumar, John Jesudasan, Vivas Bagwe, Pratap Raychaudhuri, and Sangita Bose

Applied Physics Letters 103, 262601 (2013). pdf

 

Papers on Disordered (and Nanostructured) Superconductors

 

Superconductivity in immiscible Nb–Cu nanocomposite films

Pradnya Parab, Vivas Bagwe, Bhagyashree Chalke, H Muthurajan, Pratap Raychaudhuri and Sangita Bose

Superconductor Science and Technology 30, 055005 (2017). pdf

 

Anomalous gap-edge dissipation in disordered superconductors on the brink of localization

Bing Cheng, Liang Wu, NJ Laurita, Harkirat Singh, Madhavi Chand, Pratap Raychaudhuri, N.P. Armitage

Phys. Rev. B 93, 180511 (2016). pdf

 

 

The Higgs mode in disordered superconductors close to a quantum phase transition

Daniel Sherman, Uwe S. Pracht, Boris Gorshunov, Shachaf Poran, John Jesudasan, Madhavi Chand, Pratap Raychaudhuri, Mason Swanson, Nandini Trivedi, Assa Auerbach, Marc Scheffler, Aviad Frydman and Martin Dressel

Nature Physics 11, 188–192 (2015) pdf

 

Slowing down of vortex motion at the Berezinskii-Kosterlitz-Thouless transition in ultrathin NbN films

Rini Ganguly, Dipanjan Chaudhuri, Pratap Raychaudhuri, and Lara Benfatto

Phys. Rev. B 91, 054514 (2015) pdf

 

Highly oriented, free-standing, superconducting NbN films growth on chemical vapor deposited graphene

Garima Saraswat, Priti Gupta, Arnab Bhattacharya and Pratap Raychaudhuri

APL Mat. 2, 056103 (2014) pdf

 

Correlated Conductance Fluctuations Close to the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin NbN Films

R. Koushik, Siddhartha Kumar, Kazi Rafsanjani Amin, Mintu Mondal, John Jesudasan, Aveek Bid, Pratap Raychaudhuri, and Arindam Ghosh

Phys. Rev. Lett. 111, 197001 (2013). pdf

 

Emergence of nanoscale inhomogeneity in the superconducting state of a homogeneously disordered conventional superconductor

Anand Kamlapure, Tanmay Das, Somesh Chandra Ganguli, Jayesh B. Parmar, Somnath Bhattacharyya and Pratap Raychaudhuri

Scientific Reports 3, 2979 (2013). pdf

 

Universal scaling of the order-parameter distribution in strongly disordered superconductors

G. Lemarie, A. Kamlapure, D. Bucheli, L. Benfatto, J. Lorenzana, G. Seibold, S. C. Ganguli, P. Raychaudhuri, and C. Castellani

Phys. Rev. B 87, 184509 (2013). pdf

 

Enhancement of the finite-frequency superfluid response in the pseudogap regime of strongly disordered superconducting films

Mintu Mondal, Anand Kamlapure, Somesh Chandra Ganguli, John Jesudasan, Vivas Bagwe, Lara Benfatto and Pratap Raychaudhuri

Scientific Reports 3, 1357 (2013) pdf

 

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). pdf

 

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). pdf

 

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). pdf 

(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).  pdf

 

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). pdf

 

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). pdf

 

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). pdf

 

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) pdf

 

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). pdf

 

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) pdf

 

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). pdf

 

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). pdf

 

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)pdf

 

 

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) pdf

 

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). pdf

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). pdf

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). pdf

 

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). pdf

 

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)    pdf

 

B. Multiband superconductivity

 

Andreev bound state and multiple energy gaps in the noncentrosymmetric superconductor BiPd

Mintu Mondal, Bhanu Joshi, Sanjeev Kumar, Anand Kamlapure, Somesh Chandra Ganguli, Arumugam Thamizhavel, Sudhanshu S Mandal, Srinivasan Ramakrishnan and Pratap Raychaudhuri

Phys. Rev. B 86, 094520 (2012) pdf

 

 

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) pdf

 

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) pdf

   

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)    pdf

 

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)    pdf

 

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)  pdf

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 La0.7Ce0.3MnO3 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 La0.7Ce0.3MnO3 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 La0.7-xYxCe0.3MnO3 thin films

Kavita Bajaj, Vivas Bagwe, John Jesudasan, Pratap Raychaudhuri

Solid State Commun. 138, 549 (2006). pdf

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)    pdf

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)   pdf

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)    pdf

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)    pdf

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)   pdf

(conference) Formation of epitaxial and polycrystalline films of the electron doped system La1-xCexMnO3 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)    pdf

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)   pdf

Growth of epitaxial and polycrystalline thin films of the electron doped system La1-xCexMnO3 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)   pdf

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)    pdf

(conference) Magnetic and transport properties of the electron doped layered manganite La2.3-xYxCa0.7Mn2O7  
P. Raychaudhuri, A. K. Nigam, C. Mitra, S. K. Dhar and R. Pinto
Physica B: Condensed Matter, 259-261, 835 (1999)   pdf

The metal - insulator transition and ferromagnetism in the electron-doped layered manganites
La2.3-xYxCa0.7Mn2O7( 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)   pdf

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) pdf

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)  pdf

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)  pdf

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)  pdf

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)pdf 

Evolution of transport and magnetic properties with dysprosium doping in La0.7-xDyxSr0.3MnO3 (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)   pdf

The effect of holmium doping on the magnetic and transport properties of
La0.7-xHoxSr0.3MnO3 (0<x<0.4)
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)  pdf

Other Papers

Superconductivity at the highest transition temperature of 8.1 K in a simple cubic AuxSb1-x-yTey alloy system synthesized under high pressure

A. Iyo, K. Hira, K. Tokiwa, Y. Tanaka, I. Hase, T. Yanagisawa, N. Takeshita, K. Kihou, C. H. Lee, P. M. Shirage, P. Raychaudhuri, and H. Eisaki

Superconductor Science and Technology 27, 025005 (2014). pdf

 

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

Solid State Commun, 136, 369 (2005).pdf


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).pdf

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

Peak-effect, a new phenomenon observed at microwave frequencies in high Tc 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)   pdf

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)   pdf

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)   pdf

(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)  pdf

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)  pdf