Superconductivity and nano-structured materials

Professor Kunchur’s research in superconductivity is internationally recognized and he has been invited over a hundred times to speak in 14 countries. He has been elected a Fellow of the American Physical Society, selected as a National Research Council Senior Fellow. He has won USC’s Russell Research Award as well as external research awards. His work has been cited in over 65 books and review articles and was continuously funded for 20 years by the U.S. Department of Energy. Kunchur's research in superconductivity has led to the discovery of new effects such as the Hot-Electron Vortex Instability, Flux Fragmentation, Flux-Creep Memory Effect, etc. His group provided historic confirmations of phenomena such as : Free flux flow, Current-Induced Pair Breaking in HTS, Superfluid Ballistic Acceleration, etc.
Elsevier’s Encyclopedia named a phase and effect after Kunchur
:


Selected publications:

 Evaluating Superconductors through Current Induced Depairing, M. N. Kunchur, Condens. Matter 4, 54 (2019). pdf file

 Dissipative-regime measurements as a tool for confirming and characterizing near-room-temperature superconductivity, C. L. Dean and M. N. Kunchur, review article in Quantum Studies: Mathematics and Foundations 5, 111-121  (2018).

 Anomalous oscillatory magnetoresistance in superconductors, M. N. Kunchur, C. L. Dean, and B. I. Ivlev, Phys. Rev. B 94, 054504 (2016).

Current driven vortex-antivortex pair breaking and vortex explosion in the Bi2Te3/FeTe interfacial superconductor, C. L. Dean, M. N. Kunchur, Q.L. He, H. Liu, J. Wang, R. Lortz, I.K. Sou, Physica C 527, 46 (2016).  pdf file

Energy Losses in Superconductors, C. L. Dean, M. N. Kunchur, J. of Power and Energy Eng. 4, 20 (2016).

Anomalous oscillatory magnetoresistance in superconducting transitions, M. N. Kunchur, C. L. Dean, and B. I. Ivlev, submitted to Phys. Rev. Lett.  (2016).

Current induced depairing in the Bi2Te3/FeTe interfacial superconductor, M. N. Kunchur, C. L. Dean, N. Shayesteh Moghadam, J. M. Knight, Q. L. He, H. Liu, J. Wang, R. Lortz, I. K. Sou, and A. Gurevich, Phys. Rev. B 92, 094502 (2015).  pdf file

Pinning mechanism in electron-doped HTS Nd2-xCexCuO4-d epitaxial films, A. Guarino, A. Leo, G. Grimaldi, N. Martucciello, C. Dean, M. N. Kunchur, S. Pace and A. Nigro, Supercond. Sci. Technol. 27, 124011 (2014).

Depairing current density of Nd2-xCexCuO4-d superconducting films, M. N. Kunchur, C. Dean, M. Liang, N. S. Moghaddam, A. Guarino, A. Nigro,G. Grimaldi, A. Leo, Physica C 495, 66 (2013).

Depairing current density of infinite-layer Sr1-xLaxCuO2 superconducting films,
M. Liang, M. N. Kunchur, L. Fruchter, Z.Z. Li, Physica C 492, 178 (2013).

The Vortex Explosion Transition, M. N. Kunchur, M. Liang, and A. Gurevich, AIP Conf. Proc. 1512, 19 (2013).

Thermally activated dynamics of spontaneous perpendicular vortices tuned by parallel magnetic fields in thin superconducting films, M. N. Kunchur, M. Liang, and A. Gurevich, Phys. Rev. B 86, 024521 (2012). pdf file

Non-Linear and Unstable Flux Vortex Dynamics, M. N. Kunchur, M. Liang, J. Hua, and Z. Xiao, AIP Conf. Proc. 1349, 911 (2011).

Transient response of a superconductor in an applied electric field, M. N. Kunchur and G. F. Saracila, Ch. no. 10, pg. 129 in “Physical Properties of Nanosystems”, NATO Science for Peace and Security Series B: Physics and Biophysics; Bonca, Janez; Kruchinin, Sergei (Eds.); 1st Edition, 2011, IX, 350 p., Hardcover; ISBN: 978-94-007-0043-7 (2011).

Vortex instability in molybdenum-germanium superconducting films, M. Liang and M. N. Kunchur, Phys. Rev. B 82, 144517 (2010).  pdf file

Evaluating free flux flow in low-pinning molybdenum-germanium superconducting films, M. Liang, M. N. Kunchur, J. Hua and Z. Xiao, Phys. Rev. B 82, 064502 (2010). pdf file

Ballistic acceleration of a supercurrent in a superconductor, G. F. Saracila and M. N. Kunchur, Phys. Rev. Lett. 102, 077001 (2009). pdf file

Time evolution of a supercurrent during an applied voltage, M. N. Kunchur and G. F. Saracila, Proceedings of the 53rd DAE Solid State Physics Symposium, vol. 53, pg. 907 (2008).

Temporal resolution of hearing probed by bandwidth restriction, M. N. Kunchur, Acta Acustica united with Acustica 94, 594–603 (2008). pdf file

High-field flux dynamics in disordered two-band superconductivity, J. M. Knight and M. N. Kunchur, book chapter no. 7, pg. 71 in "Electron Transport in Nanosystems", Eds. J. Bonca and S. Kruchinin, Springer Publishers (ISBN: 978-1-4020-9144-5), Dordrecht, The Netherlands (2008).

Probing the temporal resolution and bandwidth of human hearing , M. N. Kunchur, Proc. of Meetings on Acoustics (POMA) 2, 050006 (2008). pdf file

Flux flow in a two-band superconductor with delocalized electric fields, J. M. Knight and M. N. Kunchur, Phys. Rev. B 77, 024516 (2008). pdf file

Audibility of temporal smearing and time misalignment of acoustic signals, M. N. Kunchur, Technical Acoustics, 17 (2007).  pdf file

Energy relaxation at a hot-electron vortex instability, J. M. Knight and M. N. Kunchur, Phys. Rev. B 74, 64512 (2006). pdf file

Anomalous flux dynamics in magnesium diboride films, M. N. Kunchur, G. Saracila, D. A. Arcos, Y. Cui, A. Pogrebnyakov, P. Orgiani, X. X. Xi, P. W. Adams, and D. P. Young, Physica C 437-438, 171-175 (2006). pdf file

Suppressed flux motion in magnesium diboride films, D. H. Arcos and M. N. Kunchur, Phys. Rev. B (in press) 2005. pdf file

Current-Induced Pair Breaking in Magnesium Diboride, M. N. Kunchur, Topical Review published in the J. Phys.: Condens. Matter 16, R1183-R1204 (2004). pdf file

The pair-breaking critical current density of magnesium diboride,
M. N. Kunchur, Sung-Ik Lee, and W. N. Kang, Phys Rev. B 68, 064516 (2003).
pdf file

Critical flux pinning and enhanced upper-critical-field in magnesium diboride films, M. N. Kunchur, C. Wu, B. I. Ivlev, Sung-Ik Lee, and W. N. Kang, Phys. Rev. B 68, 100503 (2003). pdf file ps file

Mixed-state transport characteristics of magnesium diboride films, M. N. Kunchur, C. Wu, D. H. Arcos, G. Saracila, E.-M. Choi, K. H. P. Kim, W. N. Kang, S.-I. Lee, Braz. J. Phys.  33, 705 (2003). pdf file ps file

Unstable flux flow due to heated electrons in Y-Ba-Cu-O films, M. N. Kunchur, Phys. Rev. Lett. 89, 137005 (2002). pdf file

Hot-Electron Instability in Superconductors, M. N. Kunchur and J. M. Knight, Mod. Phys. Lett. B 17, 549 (2003). pdf file

Shear fragmentation of unstable flux flow, M. N. Kunchur, B.I. Ivlev,  and J. M. Knight, Phys. Rev. B 66, 60505 (2002). pdf file

Steps in the negative-differential-conductivity regime of a superconductor, M. N. Kunchur, B.I. Ivlev,  and J. M. Knight, Phys. Rev. Lett. 87, 177001 (2001). pdf file

Van Hove singularities and vortex motion in superconductors, B.I. Ivlev, M. N. Kunchur  and S. Mejia Rosales, Phys. Rev. B  64, 024508 (2001). pdf file

Metallic normal state of YBa2Cu3O7 , M. N.Kunchur, B. I. Ivlev, D. K. Christen, and J. M. Phillips, Phys. Rev. Lett. 84, 5204 (2000). pdf file

Cherenkov resonances in vortex dissipation in superconductors, B.I. Ivlev, S. Mejia Rosales, and M. N. Kunchur, Phys. Rev. B 60, 12419 (1999). pdf file

Hysteretic Internal Fields and Critical Currents in Polycrystalline Superconductors, M. N. Kunchur and T. R. Askew, J. Appl. Phys. 84, 6763 (1998).pdf file GZipped PS file

Decomposition of the Hall effect in the mixed state of superconductors, M. N. Kunchur, D. K. Christen, and B. I. Ivlev, Physica C 307, 241 (1998).pdf file

High frequency effects in superconductors from short duration dc pulses, M. N. Kunchur, D. K. Christen, and J. M. Phillips, pg. 180 in "Advances in Superconductivity and its Applications to Microwaves", Eds. G. P. Srivasatava and R. P. Tandon, Allied Publishers Ltd., New Delhi (1998).pdf file ps file

Hall effect in YBa2Cu3O7 in the limit of free flux flow, M. N. Kunchur, D. K. Christen, C. E. Klabunde, and J. M. Phillips, Phys. Rev. Lett. 72, 2259 (1994).pdf file

Pair-breaking effect of high current densities on the superconducting transition on YBa2Cu3O7 , M. N.Kunchur, D. K. Christen, C. E. Klabunde, and J. M. Phillips, Phys. Rev. Lett. 72, 752 (1994).pdf file

Observation of free flux flow at high dissipation levels in YBa2Cu3O7 epitaxial films, M. N. Kunchur, D. K. Christen, and J. M. Phillips, Phys. Rev. Lett 70, 998 (1993). pdf file

Exploring the dissipative regime of superconductors for practical current-lead applications, M. N. Kunchur, D. K. Christen, C. E. Klabunde, and K. Salama, Appl. Phys. Lett. 67, 848 (1995).pdf file

Novel transport behavior found in the dissipative regime of superconductors, M. N. Kunchur, Mod. Phys. Lett. B. 9, 399 (1995). (Hard copy can be sent by mail upon requrest.)

Transport Behavior in Superconductors at Extreme Dissipation Levels, M. N. Kunchur, D. K. Christen, and B. I. Ivlev, pg. 135 in "Advances in Superconductivity: New Materials, Critical Currents and Devices", Eds. R. Pinto, S. K. Malik, A. K. Grover, and P. Ayyub, New Age International Ltd. Publishers, New Delhi (1997).pdf file

Critical fields and critical currents of superconducting discs in transverse magnetic fields, M.N. Kunchur and S.J. Poon, Phys. Rev. B 43, 2916 (1991).pdf file

Superposition of decaying flux distributions: A memory effect from flux creep, M.N. Kunchur, S.J. Poon, and M.A. Subramanian, Phys. Rev. B 41, 4089 (1990).pdf file

Absence of Superconductivity in Metallic Granular Aluminum, M. Kunchur, P. Lindenfeld, W. L. Mclean, and J. S. Brooks, Phys. Rev. Lett. 59, 1232 (1987).pdf file

Back to Kunchur's Homepage | USC Homepage | USC Physics Homepage