Interplay of hopping conductivity and superconductivity in magnetic superconductor RuSr2(Eu1.5Ce0.5)Cu2O10−δ
In this work, we analyze the temperature dependencies of resistance and magnetoresistance for two RuSr2(Eu1.5Ce0.5)Cu2O10−δ ceramic samples, one of which was left in the as-prepared state while another one was oxygen saturated. The measurements on these samples were made soon after preparation and r...
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Veröffentlicht in: | Low temperature physics (Woodbury, N.Y.) N.Y.), 2020-06, Vol.46 (6), p.584-593 |
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Sprache: | eng |
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Zusammenfassung: | In this work, we analyze the temperature dependencies of resistance and magnetoresistance for two RuSr2(Eu1.5Ce0.5)Cu2O10−δ ceramic samples, one of which was left in the as-prepared state while another one was oxygen saturated. The measurements on these samples were made soon after preparation and repeated after their long storage (10 years) in an ambient atmosphere when they lost most of their over-stoichiometric and part of stoichiometric oxygen. Having studied the widest possible range of oxygen concentrations, we are trying to clarify not only the questions of stability of superconducting state in ruthenocuprates, but also the interplay of various types of electronic hopping conductivity and superconductivity in granular magnetic material. Despite the significant progress made in understanding the properties of disordered conductors, the old question of mutual influence and competition between localization and superconductivity still not clear. Investigation of the properties of electron transport as it approaches the metal-insulator transition will be useful and important. |
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ISSN: | 1063-777X 1090-6517 |
DOI: | 10.1063/10.0001240 |