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Optical and thermodynamic properties of the high-temperature superconductor HgBa_2CuO_4+delta

机译:高温的光学和热力学性质   超导体HgBa_2CuO_4 + delta

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摘要

In- and out-of-plane optical spectra and specific heat measurements for thesingle layer cuprate superconductor Hg-1201 at optimal doping (Tc = 97 K) arepresented. Both the in-plane and out-of-plane superfluid density agree wellwith a recently proposed scaling relation rho_{s}=sigma_{dc}T_{c}. It is shownthat there is a superconductivity induced increase of the in-plane lowfrequency spectral weight which follows the trend found in underdoped andoptimally doped Bi-2212 and optimally doped Bi-2223. We observe an increase ofoptical spectral weight which corresponds to a change in kinetic energy ofapproximately 0.5 meV/Cu which is more than enough to explain the condensationenergy. The specific heat anomaly is 10 times smaller than in YBCO and 3 timessmaller than in Bi-2212. The shape of the anomaly is similar to the oneobserved in YBCO showing that the superconducting transition is governed bythermal fluctuations.
机译:给出了单层铜酸盐超导体Hg-1201在最佳掺杂(Tc = 97 K)时的面内和面外光谱以及比热测量结果。平面内和平面外的超流体密度都与最近提出的比例关系rho_ {s} = sigma_ {dc} T_ {c}非常吻合。结果表明,超导引起的平面内低频频谱权重的增加遵循了在掺杂不足和最佳掺杂的Bi-2212和掺杂最佳的Bi-2223中发现的趋势。我们观察到光学光谱权重的增加,这对应于动能的大约0.5 meV / Cu的变化,这足以解释冷凝能。比热异常比YBCO小10倍,比Bi-2212小3倍。异常的形状与YBCO中观察到的形状相似,表明超导转变受热涨落控制。

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