Electronic specific heat of YBa2Cu3O6+x from 1.8 to 300 K
作者： J. W. Loram , K. A. Mirza , J. R. Cooper , W. Y. Liang , J. M. Wade
DOI: 10.1007/BF00730405
关键词: Condensed matter physics 、 Band gap 、 BCS theory 、 Pairing 、 Doping 、 Metal 、 Mean field theory 、 Pseudogap 、 Superconductivity 、 Physics
摘要: We have determined for the first time electronic specific heatγ(x, T) of YBa2Cu3O6+x 0.16≤x≤0.97 from 1.8 to 300 K. Weakly superconducting behavior betweenx=0.4 and 0.8 progresses rapidly strong coupling BCS-like metallic normal state forx> 0.9. However, continuous development entropyS(x, withx andT across entire series suggests a progressive modification low-energy spin spectrum with hole doping rather than simple band model. Fermi statistics andk-space pairing allx is indicated by magnitude andT-dependence ofS(x, T). Pseudogap inS(x, observed over temperature region aboveT c , which increases oxygen depletion around 200 K forx∼0.7. This loss entropy reflects normal-state correlations apparently unrelated pairing.
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