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Title: Comparison of pinning parameters between low-{ital T}{sub {ital c}} superconductors and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}

Abstract

ac flux-profile measurements are used to determine the current density {ital j}, the reversible penetration depth {lambda}{prime} of a pinned flux lattice, and the reversible displacement {ital d}, which is the distance flux can move before being unpinned. Both parameters {lambda}{prime} and {ital d} describe the elastic regime of the interaction between vortices and defects whereas the current corresponds to the maximum elastic or plastic distortion. The influence of thermal relaxation on these parameters and on ac measurements in general is discussed. Anomalous features of the flux profiles observed in various low-{ital T}{sub {ital c}} superconductors are correlated with the saturation of the current based on plastic deformation of the vortex lattice. A comparison with flux profiles from single-crystalline and melt-textured YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} shows the same anomalous feature. This demonstrates the importance of plastic shear also in high-{ital T}{sub {ital c}} superconductors which seems to be present in the whole magnetic-field regime. Collective pinning and the related peak effect of the current in V{sub 3}Si are compared with the fishtail effect in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals. The different magnetic-field dependences of {lambda}{prime} and {ital d} in the region of maximum current point to differences between thesemore » observations. Decreasing current correlated with decreasing {lambda}{prime} in specimens with a fishtail are related to a softening of the vortex lattice at fields below the maximum current. This anomalous feature is not observed in samples with a current continuously decreasing with magnetic field.« less

Authors:
 [1];  [2]; ; ; ;  [1];  [3];  [4];  [5]
  1. Forschungszentrum Karlsruhe, Institut fuer Technische Physik Universitaet Karlsruhe, Postfach 3640, D-76021 Karlsruhe (Germany)
  2. Forschungszentrum Karlsruhe, Institut fuer Technische Physik, Postfach 3640, D-76027 Karlsruhe (Germany)
  3. Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820 (Japan)
  4. Advanced Materials and Technology Research Laboratories, Nippon Steel Co., 1618 Ida, Nakahara-Ku, Kawasaki 211 (Japan)
  5. Department of Mechanical Engineering, Texas Center of Superconductivity at University of Houston, Houston, Texas 7704 (United States)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
115873
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 52; Journal Issue: 10; Other Information: PBD: 1 Sep 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; SUPERCONDUCTORS; MAGNETIC FLUX; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; NIOBIUM COMPOUNDS; TITANIUM COMPOUNDS; VANADIUM SILICIDES; LEAD SULFIDES; MOLYBDENUM SULFIDES; PENETRATION DEPTH; ELECTRIC CURRENTS; PLASTICITY; FREQUENCY DEPENDENCE; HZ RANGE; COMPARATIVE EVALUATIONS

Citation Formats

Kuepfer, H, Zhukov, A A, Physics Department, Moscow State University, 117234 Moscow, Kresse, R, Meier-Hirmer, R, Jahn, W, Wolf, T, Matsushita, T, Kimura, K, and Salama, K. Comparison of pinning parameters between low-{ital T}{sub {ital c}} superconductors and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.52.7689.
Kuepfer, H, Zhukov, A A, Physics Department, Moscow State University, 117234 Moscow, Kresse, R, Meier-Hirmer, R, Jahn, W, Wolf, T, Matsushita, T, Kimura, K, & Salama, K. Comparison of pinning parameters between low-{ital T}{sub {ital c}} superconductors and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. United States. https://doi.org/10.1103/PhysRevB.52.7689
Kuepfer, H, Zhukov, A A, Physics Department, Moscow State University, 117234 Moscow, Kresse, R, Meier-Hirmer, R, Jahn, W, Wolf, T, Matsushita, T, Kimura, K, and Salama, K. 1995. "Comparison of pinning parameters between low-{ital T}{sub {ital c}} superconductors and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}". United States. https://doi.org/10.1103/PhysRevB.52.7689.
@article{osti_115873,
title = {Comparison of pinning parameters between low-{ital T}{sub {ital c}} superconductors and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}},
author = {Kuepfer, H and Zhukov, A A and Physics Department, Moscow State University, 117234 Moscow and Kresse, R and Meier-Hirmer, R and Jahn, W and Wolf, T and Matsushita, T and Kimura, K and Salama, K},
abstractNote = {ac flux-profile measurements are used to determine the current density {ital j}, the reversible penetration depth {lambda}{prime} of a pinned flux lattice, and the reversible displacement {ital d}, which is the distance flux can move before being unpinned. Both parameters {lambda}{prime} and {ital d} describe the elastic regime of the interaction between vortices and defects whereas the current corresponds to the maximum elastic or plastic distortion. The influence of thermal relaxation on these parameters and on ac measurements in general is discussed. Anomalous features of the flux profiles observed in various low-{ital T}{sub {ital c}} superconductors are correlated with the saturation of the current based on plastic deformation of the vortex lattice. A comparison with flux profiles from single-crystalline and melt-textured YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} shows the same anomalous feature. This demonstrates the importance of plastic shear also in high-{ital T}{sub {ital c}} superconductors which seems to be present in the whole magnetic-field regime. Collective pinning and the related peak effect of the current in V{sub 3}Si are compared with the fishtail effect in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals. The different magnetic-field dependences of {lambda}{prime} and {ital d} in the region of maximum current point to differences between these observations. Decreasing current correlated with decreasing {lambda}{prime} in specimens with a fishtail are related to a softening of the vortex lattice at fields below the maximum current. This anomalous feature is not observed in samples with a current continuously decreasing with magnetic field.},
doi = {10.1103/PhysRevB.52.7689},
url = {https://www.osti.gov/biblio/115873}, journal = {Physical Review, B: Condensed Matter},
number = 10,
volume = 52,
place = {United States},
year = {1995},
month = {9}
}