Magnetic Fieid-lnduced Recovery of Superconductivity in Epitaxial YBa2Cu3O7-x Films at Microwave Frequencies

Hein, Matthias; Bauer, C.; Diete, W.; Hensen, S.; Kaiser, T.; Kresfn, V. Z.; Müller, Günter

doi:10.1007/bf02767683

Cited by 25 publications

(34 citation statements)

References 22 publications

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“…However, it is obvious that the feature of Fig.4 is qualitatively different from that of the similar analysis given in Fig.5 of Ref. [17]. So it is doubtful that the anomalous response we observed comes from the same origin as that in Ref.…”

Section: Discussioncontrasting

confidence: 54%

“…This can also explain why Fig.4 is qulitatively different from the Fig.5 in Ref. 17. This suggest that the anomalous effects may have more than one source.…”

Section: Discussionmentioning

confidence: 58%

“…So it is doubtful that the anomalous response we observed comes from the same origin as that in Ref. [17]. In addition, a phenomenological description is proposed in terms of this mechanism [30].…”

Section: Discussionmentioning

confidence: 73%

“…Recently, several groups proposed that magnetic field-induced recovery of superconductivity might account for the anomalous microwave response [17][18][19]. Magnetic impurities are likely to be present in most HTS materials.…”

Section: Discussionmentioning

confidence: 99%

“…surface resistance R s and (or) surface reactance X s change non-monotonically with applied mw or dc magnetic field, were observed [16][17][18][19]. Choudhury et al reported an anomalous field dependence of surface resistance R s of a YBCO suspended line resonator in the presence of a weak, perpendicular dc magnetic field at 10K.…”

Section: Introductionmentioning

confidence: 99%

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Anomalous microwave response of high-temperature superconducting thin-film microstrip resonator in weak dc magnetic fields

Rao

Ong

Jin

et al. 1999

Physica C: Superconductivity

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We have studied an anomalous microwave (mw) response of superconducting YBa2Cu3O 7−δ (YBCO) microstrip resonators in the presence of a weak dc magnetic field, H dc . The surface resistance (Rs) and reactance (Xs) show a correlated non-monotonic behaviour as a function of H dc . Rs and Xs were found to initially decrease with elevated H dc and then increase after H dc reaches a crossover field, Hc, which is independent of the amplitude and frequency of the input mw signal within the measurements. The frequency dependence of Rs is almost linear at fixed H dc with different magnitudes (Hc). The impedance plane analysis demonstrates that rH, which is defined as the ratio of the change in Rs(H dc ) and that in Xs(H dc ), is about 0.6 at H dc Hc. The H dc dependence of the surface impedance is qualitatively independent of the orientation of H dc .

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Section: Discussioncontrasting

confidence: 54%

“…This can also explain why Fig.4 is qulitatively different from the Fig.5 in Ref. 17. This suggest that the anomalous effects may have more than one source.…”

Section: Discussionmentioning

confidence: 58%