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Title: Paramagnetic meissner effect in YBa2Cu307-δ : a non-resonant microwave absorption study
Authors: Bhat, S.V.
Rastogi, A.
Kumar, N.
Nagarajan, R.
Issue Date: 1994
Publisher: Elsevier B.V.
Citation: Physica C: Superconductivity, 1994, Vol. 219, p87
Abstract: The low-field dependence of non resonant microwave absorption (MWA) in polycrystalline samples of YBa2Cu3O7−δ with 0.1≤δ≤0.5 has been measured at T < Tc along with simultaneous monitoring of paramagnetic impurities in the chain copper (Cu-I) sites by EPR spectroscopy. MWA exhibits a cross-over from the normal zero-field minimum to an anomalous zero-field maximum accompanied by the gradual appearance and growth of the EPR signal as δ is changed from 0.1 to 0.5. It is to be noted that in the δ = 0.3−0.4 composition range, oxygen vacancies are disordered giving rise to magnetic moments due to isolated Cu2+ impurity ions. This correlation of the anomalous MWA with isolated paramagnetic Cu2+ impurities is consistent with the presence of π junctions, earlier implicated in the paramagnetic Meissner effect (PME), which in turn is related to the anomalous MWA.
Description: Restricted Access
ISSN: 0921-4534
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Copyright: 1994 Elsevier B.V.
Appears in Collections:Research Papers (TP)

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