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

doi:10.1016/0921-4534(93)90610-3

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

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

Electronic Devices

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17 Citations (Scopus)

Abstract

The expression for the thermal-fluctuation-induced depinning line, T = T_P (B_e), is derived theoretically for weakly pinning high-T_c superconductors. In the derivation, it is shown that the thermal displacement of pinned fluxoids, u_th reduces the critical current density as J_c = J_c0 ( - 〈u²_th〉/d²_p)^{3 2}, where J_c0 is the critical current density in the absence of u_th and d_p is the effective half width of the summed-up pinning potential. Then T_p (itB_e) is determined as the temperature at which J_c becomes zero due to the increase of 〈u²_th〉 with the increase of T in the external flux density of B_e. The relation of T_p(B_e) with the irreversibility line of T_i(B_e) and the flux melting line of T_m(B_e) is also discussed.

Original language	English
Pages (from-to)	424-434
Number of pages	11
Journal	Physica C: Superconductivity and its applications
Volume	212
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(93)90610-3
Publication status	Published - Jul 15 1993

All Science Journal Classification (ASJC) codes

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

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10.1016/0921-4534(93)90610-3

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title = "A theory of thermal-fluctuation-induced depinning line in weakly pinning high-Tc superconductors",

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.",

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T1 - A theory of thermal-fluctuation-induced depinning line in weakly pinning high-Tc superconductors

AU - Yamafuji, K.

AU - Fujiyoshi, T.

AU - Toko, K.

AU - Matsuno, T.

AU - Kishio, K.

AU - Matsushita, T.

PY - 1993/7/15

Y1 - 1993/7/15

N2 - 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.

AB - 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.

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

Abstract

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