Josephson plasma and Josephson vortex lattice in high Tc superconductors with an applied magnetic field parallel to the layers

2004 ◽  
Vol 412-414 ◽  
pp. 444-448 ◽  
Author(s):  
Hideki Matsumoto ◽  
Tomio Koyama
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Vortex Lattice ◽  
Josephson Vortex ◽  
High Tc Superconductors ◽  
High Tc ◽  
Field Parallel ◽  
Josephson Plasma

MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS VII — ESR OF DPPH COATED ON A THIN BiSrCaCuO FILM FABRICATED ON MgO(100) SUBSTRATE

1992 ◽  
Vol 06 (11) ◽  
pp. 675-682
Author(s):  
K. SUGAWARA ◽  
T. SUGIMOTO ◽  
Y. SHIOHARA ◽  
S. TANAKA
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Temperature Dependence ◽  
Microwave Absorption ◽  
Current Density ◽  
Applied Magnetic Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Absorption Studies ◽  
Mpmg Method

ESR of DPPH coated on a Bi-Sr-Ca-Cu-O (BSCCO) film (350 Å thick) fabricated on MgO(100) substrate by MOCVD was studied. Temperature dependence of the ESR peak-to-peak linewidth, ΔH pp , and the effect of applied magnetic field on ΔH pp have been studied below about 100 K. The results were compared with those of ESR of DPPH coated on ceramic Y-Ba-Cu-O samples (powder and bulk) made by the MPMG method. The DPPH ESR for the BSCCO film revealed that ΔH pp was independent of applied magnetic field up to about 9 kG. In addition, no similarity between the temperature dependence of the excess ESR linewidth of the DPPH and that of critical current density was found for the BSCCO film. These results for the BSCCO film are different from those for the MPMG YBCO samples.

MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS VIII — ESR OF DPPH COATED ON BiSrCaCuO FILMS FABRICATED ON MgO (100) SUBSTRATES

1992 ◽  
Vol 06 (14) ◽  
pp. 879-889
Author(s):  
K. SUGAWARA ◽  
S. TANAKA
Keyword(s):  
Magnetic Field ◽  
Film Thickness ◽  
Temperature Dependence ◽  
Applied Magnetic Field ◽  
Zero Field ◽  
Magnetic Field Effects ◽  
High Tc Superconductors ◽  
Thick Sample ◽  
High Tc ◽  
Absorption Studies

ESR of DPPH coated on Bi - Sr - Ca - Cu - O films fabricated on MgO (100) substrates by MOCVD have been studied for samples with different thicknesses, 1000 Å and 100 Å. Temperature dependence of the ESR peak-to-peak linewidth, ΔH pp , revealed that ΔH pp , increases with film thickness. The excess ESR linewidth, δ (ΔH pp ) was also analyzed in terms of (1-t)α, with t=T/T c , giving for example α=4±1 for the 1000 Å thick sample. The ESR lineshapes were distorted by rotating the samples in applied magnetic fields. Severe distortion was found for the 1000 Å sample below about 30 K, but the distortion almost disappears at temperatures above 30 K. The applied magnetic field effects were also examined in both field-cooled and zero-field-cooled cases.

scholarly journals STUDY ON AC LOSSES OF HIGH Tc SUPERCONDUCTORS IN 50Hz APPLIED MAGNETIC FIELD

1999 ◽  
Vol 48 (1) ◽  
pp. 148
Author(s):  
WANG JIN-XING ◽  
YANG SHI-ZHONG ◽  
HE YAN-FA ◽  
YANG CHAO-WEI ◽  
DUAN ZHEN-ZHONG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Ac Losses ◽  
High Tc Superconductors ◽  
High Tc

FLUCTUATION PAIRING AND HEAT CAPACITY OF HIGH Tc SUPERCONDUCTORS

1988 ◽  
Vol 02 (10) ◽  
pp. 1159-1163 ◽  
Author(s):  
R.S. THOMPSON ◽  
V.Z. KRESIN
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Applied Magnetic Field ◽  
High Tc Superconductors ◽  
High Tc

The leading correction due to thermodynamic fluctuations to the dependence of the heat capacity on temperature and applied magnetic field is calculated for anisotropic high T c superconductors.

NEW POSSIBLE EFFECT IN HOMOGENEOUS HIGH-Tc SUPERCONDUCTORS

1989 ◽  
Vol 03 (02) ◽  
pp. 141-143
Author(s):  
W. GORZKOWSKI
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Superconducting State ◽  
High Tc Superconductors ◽  
High Tc

The following effect should be observed in certain high-T c superconductors: for T<T c , the superconducting state, after being destroyed by an applied magnetic field greater than H c2 (at T), cannot spontaneously reappear or does so after a long delay, at the temperature T.

MAGNETIC PHASES OF JOSEPHSON VORTEX IN STRONGLY ANISOTROPIC High-Tc SUPERCONDUCTORS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3357-3363
Author(s):  
KAZUTO HIRATA
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Flow Resistance ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Josephson Vortex ◽  
High Tc Superconductors ◽  
High Tc ◽  
The Magnetic Field ◽  
Ordered State

When a magnetic field is applied parallel to the superconducting layers in high-Tc superconductors (HTSCs), vortices become Josphson vortices (JVs). To study the magnetic phase diagram of JVs in strongly anisotropic HTSCs, we propose that the JV flow-resistance measurement is a powerful probe to observe periodic oscillations in the JV flow-resistance against the magnetic field. We could determine the magnetic phase diagram of JVs in Bi -2212, in which there exist a three-dimensionally-ordered state and a two-dimensionally quasi-ordered one.

Direct Determination of the Velocity of Vortices in High-Tc Superconductors by a Non-Equilibrium Method

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3288-3291
Author(s):  
I. Kirschner ◽  
R. Laiho ◽  
A. C. Bódi ◽  
E. Lähderanta ◽  
I. Vajda
Keyword(s):  
Magnetic Field ◽  
Temperature Gradient ◽  
Vortex Motion ◽  
Direct Determination ◽  
Field Investigation ◽  
High Tc Superconductors ◽  
High Tc ◽  
Pinning Centers ◽  
Non Equilibrium

As is shown, thermally assisted vortex motion can come into being in high-T c superconductors due to the applied temperature gradient. Its behavior strongly depends on the local and global microstructure of the samples, moreover on the temperature and magnetic field. Investigation of the density, size and intensity of the pinning centers of specimens leads to the conclusion that the higher homogeneity immediately weakens and the lower one strenghtens the pinning, thus the former promotes and the latter impedes the vortex motion. The non-equilibrium experimental technique together with a.c. susceptibility measurements render possible the direct determination of the velocity of vortices. Depending on the actual microstructural state of samples it has the values between 6 × 10-2 mm/s and 18 × 10-2 mm/s in the case of Y-Ba-Cu-O specimens investigated.

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