A. Gurevich

Suppression of the critical temperature of superconducting NdFeAs(OF) single crystals by Kondo-like defect sites induced by alpha-particle irradiation (2009)

Tarantini, C., Putti, M., Gurevich, A., Shen, Y., Singh, R. K., Rowell, J. M., ...

We report a comprehensive investigation of the suppression of the critical temperature Tc of NdFeAs(OF) single crystal by alpha-particle irradiation. Our data indicate that irradiation defects...

New Fe-based superconductors: properties relevant for applications (2009)

Putti, M, Pallecchi, I, Bellingeri, E, Tropeano, M, Ferdeghini, C, Tarantini, A Palenzona C, ...

Less than two years after the discovery of high temperature superconductivity in oxypnictide LaFeAs(O,F) several families of superconductors based on Fe layers (1111, 122, 11, 111) are available....

Magnetic ordering of the RE lattice in REFeAsO: the odd case of Sm. A specific heat investigation in high magnetic field (2009)

Riggs, S., Tarantini, C., Jaroszynski, J., Gurevich, A., Palenzona, A., Putti, M., ...

We have investigated the evolution of the low temperature specific heat anomaly (TN=5.4K in zero field) in polycrystalline SmFeAsO samples with magnetic fields up to 35T. The anomaly remains very...

Measurement of the nonlinear Meissner effect in superconducting Nb films using a resonant microwave cavity: A probe of unconventional pairing symmetries (2009)

Groll, N., Gurevich, A., Chiorescu, I.

We report observation of the nonlinear Meissner effect (NLME) in Nb films by measuring the resonance frequency of a planar superconducting cavity as a function of the magnitude and the orientation of...

Intergrain current flow in a randomly oriented polycrystalline SmFeAsO0.85 oxypnictide (2009)

Kametani, F., Li, P., Abraimov, D., Polyanskii, A. A., Yamamoto, A., Jiang, J., ...

We report a direct current transport study of the local intergrain connections in a polycrystalline SmFeAsO0.85 (Sm1111) bulk, for which we earlier estimated significant intergranular critical...

Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals (2009)

Lee, S., Jiang, J., Weiss, J. D., Folkman, C. M., Bark, C. W., Tarantini, C., ...

We show that despite the low anisotropy, strong vortex pinning and high irreversibility field Hirr close to the upper critical field Hc2 of Ba(Fe1-xCox)2As2, the critical current density Jgb across...

Magnetoresistance Oscillations in Granular Superconducting Niobium Nitride Nanowires (2009)

Patel, U., Xiao, Z. L., Gurevich, A., Avci, S., Hua, J., Divan, R., ...

We report on magnetoresistance oscillations in superconducting NbNx nanowires synthesized through ammonia gas annealing of NbSe3 precursor nanostructures. Even though the transverse dimensions of the...

High-field phase-diagram of Fe arsenide superconductors (2009)

Jo, Y. J., Jaroszynski, J., Yamamoto, A., Gurevich, A., Riggs, S. C., Boebinger, G. S., ...

Here, we report an overview of the phase diagram of single layered and double layered Fe arsenide superconductors at high magnetic fields. Our systematic magnetotransport measurements of...

Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal (2008)

Jaroszynski, J., Hunte, F., Balicas, L., Jo, Youn-jung, Raicevic, I., Gurevich, A., ...

We present measurements of the resistivity and the upper critical field H_c2 of Nd(O_0.7F_0.3)FeAs single crystals in strong DC and pulsed magnetic fields up to 45 T and 60 T, respectively. We found...

Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2 (2008)

Yamamoto, A., Jaroszynski, J., Tarantini, C., Balicas, L., Jiang, J., Gurevich, A., ...

We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe1-xCox)2As2. Unlike the HTS cuprates and 1111-phase oxypnictides,...

Probing multi-band superconductivity and magnetism in SmFeAsO$_{0.8}$F$_{0.2}$ single crystals by high-field vortex torque magnetometry (2008)

Balicas, L., Gurevich, A., Jo, Y. J., Jaroszynski, J., Larbalestier, D. C., Liu, R. H., ...

To probe manifestations of multiband superconductivity in oxypnictides, we measured the angular dependence of magnetic torque $\tau(\theta)$ in the mixed state of SmO$_{0.8}$F$_{0.2}$FeAs single...

Combined microstructural and magneto optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides (2008)

Kametani, F., Polyanskii, A. A., Yamamoto, A., Jiang, J., Hellstrom, E. E., Gurevich, A., ...

In order to understand why the inter- and intra-granular current densities of polycrystalline superconducting oxypnictides differ by three orders of magnitude, we have conducted combined...

Comparative High Field Magneto-Transport of Rare Earth Oxypnictides with Maximum Transition Temperatures (2008)

Jaroszynski, J., Riggs, S. C., Hunte, F., Gurevich, A., Larbalestier, D. C., Beobinger, G. S., ...

The recent discovery of a new class of superconducting oxypnictides with high transition temperatures may have profound implications for understanding unconventional high-temperature...

Evidence for two distinct scales of current flow in polycrystalline Sm and Nd iron oxypnictides (2008)

Yamamoto, A., Polyanskii, A. A., Jiang, J., Kametani, F., Tarantini, C., Hunte, F., ...

Early studies have found quasi-reversible magnetization curves in polycrystalline bulk rare-earth iron oxypnictides that suggest either wide-spread obstacles to intergranular current or very weak...

Can antiferromagnetism and superconductivity coexist in the high-field paramagnetic superconductor Nd(O,F)FeAs? (2008)

Tarantini, C., Gurevich, A., Larbalestier, D. C., Ren, Z. A., Dong, X. L., Lu, W., ...

We present measurements of the temperature and field dependencies of the magnetization M(T,H) of Nd(O0.89F0.11)FeAs at fields up to 33T, which show that superconductivity with the critical...

Size effects in the nonlinear resistance and flux creep in a virtual Berezinskii-Kosterlitz-Thouless state of superconducting films (2008)

Gurevich, A., Vinokur, V. M.

We show that the size effects radically affect the electric field-current ($E-I$) relation of superconducting films. We calculate $E(J)$ due to thermally-activated hopping of single vortices driven...

Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11 (2008)

Hunte, F., Jaroszynski, J., Gurevich, A., Larbalestier, D. C., Jin, R., Sefat, A. S., ...

The ongoing search for new superconductors has recently yielded a new family of oxypnictides composed of alternating La_2O_{2-x}F_x and Fe_2As_2 layers [1-4] with transition temperatures T_c of 25-28...

Multiple Peaks in the Angular and Field Dependence of the Critical Currents in Nb-47wt%Ti/Cu Multilayers (2007)

E. Kadyrov, L. D. Cooley, A. Gurevich, P. J. Lee, D. C. Larbalestier

Abstract⎯The effect of Nb-Ti layer thickness d s on the angular and field dependencies of J c in Nb-47wt. % Ti/Cu multilayers was investigated. J c exhibits several peaks in the field and angular...

Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering (2004)

Gurevich, A, Patnaik, S, Braccini, V, Kim, K. H., Mielke, C, Song, X, ...

We report a significant enhancement of the upper critical field Hc2 of different MgB2 samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals with different resistivities...

Effect of Fluctuations on Vortex Lattice Structural Transitions in Superconductors (2001)

Gurevich, A., Kogan, V. G.

Nonlinear structuring of the ionosphere modified by powerful radio waves at low latitudes. (1999)

Gurevich, A., Carlson, H., Kelley, M., Hagfors, T., Karashtin, A., Zybin, K.

Self-oscillations and bunching of striations in ionospheric modifications. (1998)

Gurevich, A., Hagfors, T., Carlson, H., Karashtin, A., Zybin, K.

Static and Dynamic Mechanisms of the Anomalous Field-Dependence of Magnetization in Bi-Sr-Ca-Cu-O and Bi-Pb-Sr-Ca-Cu-O Single-Crystals (1994)

Cai, X. Y., Gurevich, A., Larbalestier, D. C., Kelley, R. J., Onellion, M., Berger, H., ...

Time scales of the flux creep in superconductors. (1993)

Gurevich, A., Kuepfer, H.

Physical Review B, 48(1993) S.6477-87

Critical current in disc shaped YBaCuO films determined by an inductive method. (1992)

Polak, M., Windte, V., Schauer, W., Reiner, J., Gurevich, A., Maurer, W., ...

Proc.of the 6th Internat.Workshop on Critical Currents, Cambridge, GB, July 7-11, 1991

Critical current density and E-j characteristics of YBaCuO films deduced from inductive measurements. (1992)

Schauer, W., Windte, V., Polak, M., Reiner, J., Maurer, W., Gurevich, A., ...

Correra, L. [Hrsg.]

Time constant of the initial transient decay of the current in magnetic relaxation measurements. (1992)

Kuepfer, H., Gurevich, A., Runtsch, B., Meier-Hirmer, R., Kresse, R., Lee, D., ...

Conf.on Critical Currents in High Temperature Superconductors, Wien, A, April 22-24, 1992

Transient regimes of flux creep in high-T§c superconductors. (1992)

Gurevich, A., Kuepfer, H., Runtsch, B., Meier-Hirmer, R., Lee, D., Salama, K.

Physical Review B, 44(1992) S.12090-93

Magnetic properties of superconducting Rb§3C§6§0. (1992)

Politis, C., Buntar, V., Krauss, W., Gurevich, A.

Europhysics Letters, 17(1992) S.175-79

Critical current characterization of melt-processed YBa§2Cu§3O§7§-§x. (1991)

Kuepfer, H., Keller, C., Gurevich, A., Salama, K., Selvamanickam, V.

Kajimura [Hrsg.]

Granularitaet und Flusskriechen in schmelztexturiertem Y-Ba-Cu-O. (1991)

Kuepfer, H., Gurevich, A., Kresse, R., Meier-Hirmer, R., Salama, K., Selvamanickam, V.

55.Physikertagung und Fruehjahrstagung des Arbeitskreises Festkoerperphysik der DPG gemeinsam mit der Nederlandse Natuurkundige Vereniging -Dynamik und Statistische Physik- und dem Fachbereich Physik...

Fragmentation of magnetic flux in anisotropic superconductors. (1991)

Gurevich, A.

Physical Review Letters, 65(1990) S.3197-3200

Contactless measurement of valtage-current characteristics of high T§c thin film superconductors. (1991)

Polak, M., Windte, V., Schauer, W., Reiner, J., Gurevich, A., Wuehl, H.

Physica C, 174(1991) S.14-22

Macrovortex structure and magnetic granularity in anisotropic superconductors. (1991)

Gurevich, A.

6th Internat.Workshop on Critical Currents, Cambridge, GB, July 8-11, 1991

Magnetic flux creep as a percolation phenomenon. (1991)

Gurevich, A., Kuepfer, H., Keller, C.

Superconductor Science and Technology, 4(1991) S.91-93

Field and temperature dependent relaxation in oriented grained and single crystalline YBa§2Cu§3O§7. (1990)

Kuepfer, H., Keller, C., Gurevich, A., Meier-Hirmer, R., Wolf, T., Fluekiger, R., ...

Internat.Cryogenic Materials Conf. (ICMC 90), Garmisch-Partenkirchen, May 9-11, 1990

Distribution of pinning energies and the resistive transition in superconducting films. (1990)

Gurevich, A.

Physical Review B, 42(1990) S.4857-60

Magnetic flux creep as a percolation phenomenon. (1990)

Gurevich, A., Kuepfer, H., Keller, C.

LT-19 Satellite Conf.on High Temperature Superconductivity, Cambridge, GB, August 13-15, 1990

Magnetic field and temperature dependence of flux creep in oriented grained and single crystalline YBa§2Cu§3O§x. (1990)

Keller, C., Kuepfer, H., Gurevich, A., Meier-Hirmer, R., Wolf, T., Fluekiger, R., ...

Journal of Applied Physics, 68(1990) S.3498-3503

ANTIFERROMAGNETIC RESONANCE IN ORTHORHOMBIC WEAK FERROMAGNET YCrO3 (1971)

Sanina, V., Golovenchits, E., Fomina, T., Gurevich, A.

Antiferromagnetic resonance in YCrO3 single crystals was studied in pulse magnetic fields in 1-6mm wave-length range. The frequency vs field dependences were measured with magnetic field H0 directed...

ANTIFERROMAGNETIC RESONANCE IN ORTHORHOMBIC WEAK FERROMAGNET YCrO3 (1971)

Sanina, V., Golovenchits, E., Fomina, T., Gurevich, A.

Antiferromagnetic resonance in YCrO3 single crystals was studied in pulse magnetic fields in 1-6mm wave-length range. The frequency vs field dependences were measured with magnetic field H0 directed...