Thermally activated dissipation and irreversibility fields of bismuth oxide superconductors

H. Yamasaki; K. Endo; S. Kosaka; M. Umeda; S. Yoshida; K. Kajimura

doi:10.1103/PhysRevB.49.6913

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Thermally activated dissipation and irreversibility fields of bismuth oxide superconductors

H. Yamasaki, K. Endo, S. Kosaka, M. Umeda, S. Yoshida, K. Kajimura

DOI 10.1103/PhysRevB.49.6913 · Physical Review B

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Abstract

Thermally activated dissipation is investigated in epitaxial Bi-2:2:2:3 films in magnetic fields parallel to the c axis. For a wide temperature T and field B range the resistivity ρ shows clear Arrhenius behavior with an activation energy U0=A(1-T/Tc)/ √B : ρ(B,T)=ρ0exp(-U0/kT)=ρ0exp[-A(1-T/ Tc)/kT √B ], which is explained by thermally activated flux motion with the formation of double kinks. Temperature dependence of the irreversibility field B* is predicted by flux-creep theory as √B* =C(1/kT-1/kTc), when B* is defined by an electric-field criterion. This relation holds not only for our films but also for magnetically determined B* of Bi-2:2:2:3 samples, which suggests that the irreversibility line originates from thermally activated plastic motion of pinned flux liquid.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2Ca2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset
Bi2Sr2Ca2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	100	Pressure not reported	midpoint
Bi2Sr2Ca2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	86.5	Pressure not reported	zero_resistance
Bi2Sr2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(La,Ba)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown