An H-T diagram characterizing the activation barriers obtained from the magnetic relaxation of HgBa2Ca2Cu3O 8+δ thin film

Myoung Hwan Kim, Sung Ik Lee, Mun Seog Kim, Won Nam Kang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The magnetic relaxation of an epitaxial HgBa2Ca 2Cu3O8+δ (Hg-1223) thin film was measured at several fields and temperatures. After the activation energy and the normalized relaxation rate had been analysed, the U-j characteristics were mapped on the H-T diagram. The power-law region with a creep exponent of, which indicates large bundle creep, became a logarithmic region in the small μ limit as j went far below jc. From this analysis, we found that a large bundle of flux acts like a single vortex, the size of which was temperature independent. This behaviour is quite different from that of other cuprate superconductors. Also, the crossover temperature, Tb, between the power-law and the logarithmic regions was inversely proportional to Hβ. The fitting of Tb(β) on the H-T diagram is in good agreement with the field exponent of that was obtained from the scaling of Ueff(H).

Original languageEnglish
Pages (from-to)835-838
Number of pages4
JournalSuperconductor Science and Technology
Volume18
Issue number6
DOIs
StatePublished - Jun 1 2005

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