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Scientific article
English

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

Published inPhysica C: Superconductivity and Its Applications, vol. 200, no. 1-2, p. 1-11
Publication date1992
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.

Citation (ISO format)
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
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ISSN of the journal0921-4534
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