Single vortex creep in Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} epitaxial thin films

Journal Article · Mon Jul 01 00:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.1386· OSTI ID:285973

Wen, H H; Wang, R L; Li, H C; Yin, B; Guo, S Q; Zhao, Z X ^[1]; Yan, S L; Fang, L; Si, M S ^[2]

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1. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People`s Republic of (China)
2. Department of Electronics, Nankai University, Tianjing 300071, People`s Republic of (China)

By measuring the magnetization hysteresis loops and the remanent magnetization relaxation for an epitaxial Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} thin film, we determined the temperature dependence of the experimental critical current density {ital j}({ital T}) and the normalized relaxation rate {ital S}({ital T}) at {ital B}{sub {ital e}}=0.4 T. It is shown that the data {ital j}({ital T}) and {ital S}({ital T}) can be well fitted to the single vortex creep model with only one fitting parameter in each fitting process. The data {ital j}({ital T}) and {ital S}({ital T}) were then used as the input for the generalized inversion scheme (GIS); the output of the GIS, i.e., the temperature dependence of the true (unrelaxed) critical current density {ital j}{sub {ital c}}({ital T}) and the pinning potential {ital U}{sub {ital c}}({ital T}), follows the theoretical expressions predicted by the single-vortex collective pinning model. Finally, the magnetization (and thus the current) dependence of the activation energy {ital U}({ital M}{sub {ital T}=0}, T=0) was determined by using the magnetization relaxation data. Again, the single vortex creep model explains the resulting {ital U}({ital M}{sub {ital T}=0}, {ital T}=0 K) relation very well. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 285973
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ACTIVATION ENERGY
BARIUM OXIDES
CALCIUM OXIDES
CRITICAL CURRENT
CUPRATES
EPITAXY
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
LORENTZ FORCE
MAGNETIC FLUX
MAGNETIZATION
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THALLIUM OXIDES
THIN FILMS