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Functional behavior of the anomalous magnetic relaxation observed in melt-textured YBa2Cu3O7-δ samples showing the paramagnetic Meissner effect
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Dias, F. T., Vieira, V. N., Garcia, E. L., Wolff-Fabris, F., Kampert, Erik, Gouvêa, C .P., Schaf, J., Obradors, X., Puig, T. and Roa, J. J. (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. doi:10.1016/j.physc.2016.09.001 ISSN 0921-4534.
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Official URL: http://dx.doi.org/10.1016/j.physc.2016.09.001
Abstract
We have studied the functional behavior of the field-cooled (FC) magnetic relaxation observed in melt-textured YBa2Cu3O7-δ (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.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Library of Congress Subject Headings (LCSH): | Paramagnetism, Magnetic fields | ||||||||
Journal or Publication Title: | Physica C: Superconductivity and its Applications | ||||||||
Publisher: | Elsevier BV | ||||||||
ISSN: | 0921-4534 | ||||||||
Official Date: | 15 October 2016 | ||||||||
Dates: |
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Volume: | 529 | ||||||||
Page Range: | pp. 44-49 | ||||||||
DOI: | 10.1016/j.physc.2016.09.001 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 9 May 2017 | ||||||||
Date of first compliant Open Access: | 5 September 2017 | ||||||||
Funder: | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | ||||||||
Grant number: | Contract number 477506/2012-7 |
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