Irreversibility limits of the Abrikosov and Josephson flux dynamics in homogeneous and granular high-TC superconductors

V. N. Vieira; J. P. da Silva; J. Schaf

doi:10.1103/PhysRevB.64.094516

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Irreversibility limits of the Abrikosov and Josephson flux dynamics in homogeneous and granular high-TC superconductors

V. N. Vieira, J. P. da Silva, J. Schaf

DOI 10.1103/PhysRevB.64.094516 · Physical Review B

T1

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Abstract

The magnetic irreversibility of a high-quality YBa2Cu3O7−δ single crystal and of the granular superconductors YBa1.5Sr0.5Cu3O7−δ and YBa1.75Sr0.25Cu3O7−δ single crystals and the polycrystalline YBa1.75Sr0.25Cu3O7−δ sample in two different oxygen states was determined in great detail, as a function of applied field up to 5 T from zero-field-cooled and field-cooled dc magnetization. While the Tirr data of the pure single crystal are well described by the power law, predicted by the flux-creep models, in the whole field range, those of the granular superconductors adhere to this power law only in the high-field region. In a low-field region two quite different regimes take place: In the lowest fields the data obey a de Almeida-Thouless-like power law and above a sharp crossover field they follow a Gabay-Toulouse-like power law. These low-field features are acknowledged as the signature of a frustrated system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa1.5Sr0.5Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa1.75Sr0.25Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa1.75Sr0.25Cu3O7-δ 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
YBa1.5Sr0.5Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa1.75Sr0.25Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa1.75Sr0.25Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown