Low temperature thermal expansion and specific heat of YBa2Cu3O7−δ

Vieira, S.; Bourgeal, S.; Villar, R.; Aguilo, A.; Ramos, Miguel; Moure, C.

doi:10.1016/s0921-4534(88)80198-9

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Cited by 4 publications

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“…The coefficient of the linear term, which is anomalous in superconductors, varies erratically along the series. The coefficient b for the YBCO sample fits well within the spread of values reported in the literature [17,20]. The value of b drops significantly for the 6 wt% Ag, then increases continuously for the more Ag-concentrated samples.…”

Section: Resultssupporting

confidence: 87%

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Thermal expansion and specific heat of non-random YBCO/Ag composites

Haetinger

Castillo

Kunzler

et al. 1996

Supercond. Sci. Technol.

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We report on low-temperature thermal expansion and specific heat measurements in a series of non-random composites YBCO/Ag x wt% (x = 0, 6, 11 and 23). A reference YBCO polycrystalline sample is also investigated. At the lowest temperatures, the expansivities and specific heat are analysed as sums of a extrinsic T -linear term and a T 3 -Debye contribution. The Gr üneisen parameters are determined and shown to be almost constant for T ≥ 60 K. The values of the Gr üneisen parameters increase with the silver content in the composites.

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Section: Resultssupporting

confidence: 87%

“…(1) In normal metals, the linear term has an electronic origin whereas the cubic term is due to the lattice contribution to the thermal expansion. This type of behaviour is generally identified below 10 K in polycrystalline YBCO [16,17,20].…”

Section: Resultsmentioning

confidence: 65%