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- W2045014963 abstract "High-resolution thermal-expansion and specific-heat measurements of YBa2(Cu1−xMx)3O7−δ (M=Fe and Zn; x=0−5%) at the superconducting transition are presented. Thermal expansivity α(T) provides an alternative, to the specific heat, method for examining the bulk thermodynamics of the superconducting phase transition. We show that if, | dTc/dp>0.1 K/kbar, expansivity is a more sensitive probe of the superconducting transition than the specific heat because of a relative smaller background. The expansivity jump δα of the Fe doped samples increases by a factor of 4 with increasing x, in stark contrast to the specific heat jump δC0, which decreases and is unobservable for x=5%. For Zn, a jump in α at Tc was only observed for the x=1% sample. Calculated dTc/dp values show a large increase (factor of 20) for Fe and little change for Zn doping. These values agree well with actual pressure data, indicating the the jumps in α are electronic in nature and are not due to a structural transition. The large dTc/dp values of the Fe doped samples are discussed in terms of a disturbed oxygen coordination of Fe occupying chain sites. Anomalies in α(T) at 40–90 K and ≈ 250 K, indicative of structural changes, are also discussed." @default.
- W2045014963 created "2016-06-24" @default.
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- W2045014963 date "1991-02-01" @default.
- W2045014963 modified "2023-09-27" @default.
- W2045014963 title "Thermal-expansion, specific-heat, and pressure dependence of Tc in YBa2 (Cu1−xMx)3O7−δ: M=Fe and Zn" @default.
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- W2045014963 doi "https://doi.org/10.1016/0921-4534(91)90730-m" @default.
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