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Title: Low-field vortex dynamics over seven time decades in a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal for temperatures 13{le}{ital T}{le}83 K

Abstract

Using a custom-made dc superconducting quantum interference device (dc-SQUID) magnetometer, we have measured the time relaxation of the remanent magnetization {ital M}{sub rem} of a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal from the fully critical state for temperatures 13 K{le}{ital T}{le}83 K. The measurements cover a time window of seven decades 10{sup {minus}2} s{approx_lt}{ital t}{approx_lt}10{sup 5} s, so that the current density {ital j} can be studied from values very close to {ital j}{sub {ital c}} down to values considerably smaller than {ital j}{sub {ital c}}. From the data we have obtained (i) the flux-creep activation barriers {ital U} as a function of current density {ital j}, (ii) the current-voltage characteristics {ital E}({ital j}) in a typical range of 10{sup {minus}7}{endash}10{sup {minus}15} V/cm, and (iii) the critical current density {ital j}{sub {ital c}}(0) at {ital T}=0. Three different regimes of vortex dynamics are observed: For temperatures {ital T}{approx_lt}20 K the activation barrier {ital U}({ital j}) is logarithmic, no unique functional dependence {ital U}({ital j}) could be found for the intermediate-temperature interval 20 K{approx_lt}{ital T}{approx_lt}40 K, and finally for {ital T}{approx_gt}40 K the activation barrier {ital U}({ital j}) follows a power-law behavior with an exponent {mu}{approx_equal}0.6. From the analysis ofmore » the data within the weak collective pinning theory for strongly layered superconductors, it is argued that for temperatures {ital T}{approx_lt}20 K pancake vortices are pinned individually, while for temperatures {ital T}{approx_gt}40 K pinning involves large collectively pinned vortex bundles. A description of the vortex dynamics in the intermediate-temperature interval 20 K{approx_lt}{ital T}{approx_lt}40 K is given on the basis of a qualitative low-field phase diagram of the vortex state in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. (Abstract Truncated)« less

Authors:
; ; ;  [1];  [2]
  1. Laboratorium fuer Festkoerperphysik, Eidgenoessische Technische Hochschule Zuerich, 8093 Zuerich (Switzerland)
  2. Theoretische Physik, Eidgenoessische Technische Hochschule Zuerich, 8093 Zuerich (Switzerland)
Publication Date:
OSTI Identifier:
280191
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 53; Journal Issue: 14; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HIGH-TC SUPERCONDUCTORS; MAGNETIC FLUX; COPPER OXIDES; CALCIUM OXIDES; STRONTIUM OXIDES; BISMUTH OXIDES; MONOCRYSTALS; TEMPERATURE DEPENDENCE; RELAXATION TIME; MAGNETIZATION; CURRENT DENSITY; ACTIVATION ENERGY; PHASE DIAGRAMS

Citation Formats

Nideroest, M, Suter, A, Visani, P, Mota, A C, and Blatter, G. Low-field vortex dynamics over seven time decades in a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal for temperatures 13{le}{ital T}{le}83 K. United States: N. p., 1996. Web. doi:10.1103/PhysRevB.53.9286.
Nideroest, M, Suter, A, Visani, P, Mota, A C, & Blatter, G. Low-field vortex dynamics over seven time decades in a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal for temperatures 13{le}{ital T}{le}83 K. United States. https://doi.org/10.1103/PhysRevB.53.9286
Nideroest, M, Suter, A, Visani, P, Mota, A C, and Blatter, G. Mon . "Low-field vortex dynamics over seven time decades in a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal for temperatures 13{le}{ital T}{le}83 K". United States. https://doi.org/10.1103/PhysRevB.53.9286.
@article{osti_280191,
title = {Low-field vortex dynamics over seven time decades in a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal for temperatures 13{le}{ital T}{le}83 K},
author = {Nideroest, M and Suter, A and Visani, P and Mota, A C and Blatter, G},
abstractNote = {Using a custom-made dc superconducting quantum interference device (dc-SQUID) magnetometer, we have measured the time relaxation of the remanent magnetization {ital M}{sub rem} of a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystal from the fully critical state for temperatures 13 K{le}{ital T}{le}83 K. The measurements cover a time window of seven decades 10{sup {minus}2} s{approx_lt}{ital t}{approx_lt}10{sup 5} s, so that the current density {ital j} can be studied from values very close to {ital j}{sub {ital c}} down to values considerably smaller than {ital j}{sub {ital c}}. From the data we have obtained (i) the flux-creep activation barriers {ital U} as a function of current density {ital j}, (ii) the current-voltage characteristics {ital E}({ital j}) in a typical range of 10{sup {minus}7}{endash}10{sup {minus}15} V/cm, and (iii) the critical current density {ital j}{sub {ital c}}(0) at {ital T}=0. Three different regimes of vortex dynamics are observed: For temperatures {ital T}{approx_lt}20 K the activation barrier {ital U}({ital j}) is logarithmic, no unique functional dependence {ital U}({ital j}) could be found for the intermediate-temperature interval 20 K{approx_lt}{ital T}{approx_lt}40 K, and finally for {ital T}{approx_gt}40 K the activation barrier {ital U}({ital j}) follows a power-law behavior with an exponent {mu}{approx_equal}0.6. From the analysis of the data within the weak collective pinning theory for strongly layered superconductors, it is argued that for temperatures {ital T}{approx_lt}20 K pancake vortices are pinned individually, while for temperatures {ital T}{approx_gt}40 K pinning involves large collectively pinned vortex bundles. A description of the vortex dynamics in the intermediate-temperature interval 20 K{approx_lt}{ital T}{approx_lt}40 K is given on the basis of a qualitative low-field phase diagram of the vortex state in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. (Abstract Truncated)},
doi = {10.1103/PhysRevB.53.9286},
url = {https://www.osti.gov/biblio/280191}, journal = {Physical Review, B: Condensed Matter},
number = 14,
volume = 53,
place = {United States},
year = {1996},
month = {4}
}