A theory of thermal-fluctuation-induced depinning line in weakly pinning high-Tc superconductors

K. Yamafuji, T. Fujiyoshi, K. Toko, T. Matsuno, K. Kishio, T. Matsushita

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The expression for the thermal-fluctuation-induced depinning line, T = TP (Be), is derived theoretically for weakly pinning high-Tc superconductors. In the derivation, it is shown that the thermal displacement of pinned fluxoids, uth reduces the critical current density as Jc = Jc0 ( - 〈u2th〉/d2p) 3 2, where Jc0 is the critical current density in the absence of uth and dp is the effective half width of the summed-up pinning potential. Then Tp (itBe) is determined as the temperature at which Jc becomes zero due to the increase of 〈u2th〉 with the increase of T in the external flux density of Be. The relation of Tp(Be) with the irreversibility line of Ti(Be) and the flux melting line of Tm(Be) is also discussed.

Original languageEnglish
Pages (from-to)424-434
Number of pages11
JournalPhysica C: Superconductivity and its applications
Volume212
Issue number3-4
DOIs
Publication statusPublished - Jul 15 1993

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Superconducting materials
critical current
current density
Fluxes
Melting
derivation
flux density
melting
Temperature
temperature
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

A theory of thermal-fluctuation-induced depinning line in weakly pinning high-Tc superconductors. / Yamafuji, K.; Fujiyoshi, T.; Toko, K.; Matsuno, T.; Kishio, K.; Matsushita, T.

In: Physica C: Superconductivity and its applications, Vol. 212, No. 3-4, 15.07.1993, p. 424-434.

Research output: Contribution to journalArticle

Yamafuji, K. ; Fujiyoshi, T. ; Toko, K. ; Matsuno, T. ; Kishio, K. ; Matsushita, T. / A theory of thermal-fluctuation-induced depinning line in weakly pinning high-Tc superconductors. In: Physica C: Superconductivity and its applications. 1993 ; Vol. 212, No. 3-4. pp. 424-434.
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AU - Kishio, K.

AU - Matsushita, T.

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