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Low-temperature specific heat of the 123, 124 and 247 phases of Y-Ba-Cu-O in magnetic fields up to 14 Tesla

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Published in Physica C: Superconductivity and Its Applications. 1992, vol. 200, no. 1-2, p. 1-11
Abstract The specific heat of three samples of YBa2Cu3O7 (123), YBa2Cu4O8 (124) and YBa2Cu3.5O7.5 (247), selected using the criterion of the lowest extrinsic upturn in C/T at low temperature in zero field, was measured from 1.0 to 30 K in various magnetic fields ranging from 0 to 14 Tesla. The analysis of the data shows that the results cannot be described by a magnetic Schottky term, or by any combination of Schottky terms, including a continuous distribution. Therefore, the random Heisenberg antiferromagnetic exchange model of Bulaevskii does not apply. Alternatively, the observed behaviour may be described satisfactorily if one includes a magnetic Schottky term with an amplitude that is proportional to the applied magnetic field. This suggests a localization of quasiparticles in vortex cores. A picture of this kind is consistent with recent measurements of the local density of states in materials with an extremely small coherence length.
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SANCHEZ, David et al. Low-temperature specific heat of the 123, 124 and 247 phases of Y-Ba-Cu-O in magnetic fields up to 14 Tesla. In: Physica C: Superconductivity and Its Applications, 1992, vol. 200, n° 1-2, p. 1-11. doi: 10.1016/0921-4534(92)90315-4 https://archive-ouverte.unige.ch/unige:115726

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Deposited on : 2019-04-04

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