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Indications for enhanced flux pinning below magnetic ordering of Fe clusters in YBa2(Cu0.94Fe0.06)3O6+ y

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
204
Identifiers
DOI: 10.1016/0921-4534(92)90582-w

Abstract

Abstract Influence of magnetic ordering of Fe clusters in two different cluster states of YBa 2 (Cu 0.94Fe 0.06) 3O 6+ y on the magnetic hysteresis (flux pinning related) is demonstrated. In the crystallographically more extended and ordered Fe cluster state, obtained by processing under reducing atmosphere and subsequent reoxygenation [N,O], magnetic order on the Fe cluster occurs near T N=25 K, while T c=81 K and a relatively high magnetic hysteresis, Δ M, strongly decreases above T N. For the conventionally air-cooled materials [O], with T c=69 K, magnetic order of the more disordered clusters occurs near T N=10 K and the relatively lower Δ M again strongly decreases above T N. Flux pinning is therefore enhanced by the onset of magnetic ordering in the Fe clusters.

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