Harmonic susceptibilities of a sintered oxide superconductor

K. Yamamoto; H. Mazaki; H. Yasuoka; S. Katsuyama; K. Kosuge

doi:10.1103/PhysRevB.46.1122

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Harmonic susceptibilities of a sintered oxide superconductor

K. Yamamoto, H. Mazaki, H. Yasuoka, S. Katsuyama, K. Kosuge

DOI 10.1103/PhysRevB.46.1122 · Physical Review B

T1

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Abstract

The superconducting transition of a sintered YBa2Cu3Oy pellet with Fe impurities was measured in terms of harmonic susceptibilities χn=χn′-iχn″ (n=1, 2, 3, 5, and 7). The results were analyzed in the framework of the critical-state model and the weak-link model. Generation of the higher-harmonic susceptibilities seems to arise from the supercurrent according to the Kim-Anderson critical-state model, while the Ishida-Mazaki weak-link model, based on the assumption that the intergrain network behaves like a single loop as a whole due to its coherent nature, fails to describe the data. However, phenomenological considerations suggest that the extended weak-link model, in which a number of coaxial weak-link loops are assumed in the specimen, would be more practical for analyses of the magnetic response of oxide ceramic superconductors prepared by sintering.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2(Cu1-xFex)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown