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Title: Paramagnetic Meissner effect in YBa2Cu3O7-δ : A non-resonant microwave absorption study
Authors: Bhat, S V
Rastogi, A
Kumar, N
Nagarajan, R
Rao, C N R
Keywords: High-Temperature Superconductors
Paramagnetic Meissner effect
non-resonant microwave absorption
Issue Date: 1-Jan-1994
Publisher: Elsevier Science BV
Citation: Physica C 219(1-2), 87–92 (1994)
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
Other Identifiers: 0921-4534
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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