Paramagnetic moments and time effects in melt-textured NdBaCuO system with Nd422 inclusions

Dias, F.T.; Vieira, Vera Beatriz Guirland; Silva, D L; Wolff-Fabris, F.; Kampert, Erik; Almeida, M L; Mesquita, F.; Hneda, Marlon Luiz; Roa, J.J.

doi:10.1088/1742-6596/592/1/012064

Cited by 3 publications

(2 citation statements)

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“…2, are a clear evidence of relaxation processes occurring in our samples. Similar results can be found in the literature [7,13,14,17,20,24]. On the other hand, when low magnetic fields are applied, the magnetic flux compression mechanism is weaker than the conventional Meissner effect, and a diamagnetic moment can be observed, such as shown in the inset of the Fig.…”

Section: Fc Measurementssupporting

confidence: 91%

“…Originally the PME was observed in polycrystalline samples of high temperature superconductors [1,2], however, the effect has been observed in several superconducting systems and under different magnetic field ranges [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. A curious and interesting feature is the anomalous time dependence of the FC magnetic moment observed in some superconducting samples [7,13,14,19,20]. This behavior manifests itself as a strong paramagnetic relaxation, contrasting with the expected diamagnetic relaxation.…”

Section: Introductionmentioning

confidence: 99%

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Functional behavior of the anomalous magnetic relaxation observed in melt-textured YBa2Cu3O7-δ samples showing the paramagnetic Meissner effect

Dias

Vieira

Garcia

et al. 2016

Physica C: Superconductivity and its Applications

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(2016) Functional behavior of the anomalous magnetic relaxation observed in melt-textured YBa2Cu3O7-δ samples showing the paramagnetic Meissner effect. Physica C: Superconductivity and its Applications, 529 . pp. 44-49. Permanent WRAP URL:http://wrap.warwick.ac.uk/87956 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Corresponding author: F. T. Dias E-mail address: fabio.dias@ufpel.edu.br Alternative e-mail: diasft@gmail.com ABSTRACT We have studied the functional behavior of the field-cooled (FC) magnetic relaxation observed in melt-textured YBa2Cu3O7- (Y123) samples with 30 wt% of Y2Ba1Cu1O5 (Y211) phase, in order to investigate anomalous paramagnetic moments observed during the experiments. FC magnetic relaxation experiments were performed under controlled conditions, such as cooling rate and temperature. Magnetic fields up to 5T were applied parallel to the ab plane and along the c-axis. Our results are associated with the paramagnetic Meissner effect (PME), characterized by positive moments during FC experiments, and related to the magnetic flux compression into the samples. After different attempts our experimental data could be adequately fitted by an exponential decay function with different relaxation times. We discuss our results suggesting the existence of different and preferential flux dynamics governing the anomalous FC paramagnetic relaxation in different time intervals. This work is one of the first attempts to interpret this controversial effect in a simple analysis of the pinning mechanisms and flux dynamics acting during the time evolution of the magnetic moment. However, the results may be useful to develop models to explain this interesting and still misunderstood feature of the paramagnetic Meissner effect.

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