Infrared Probe of Transition from Superconductor to Nonmetal in YBa2s sCu12xZnxd d4O8
Infrared Probe of Transition from Superconductor to Nonmetal in YBa2s sCu12xZnxd d4O8
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YBa2s sCu12xZnxd d4O8 从超导体到非金属转变的红外探针
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
T. Timusk
中科院分区：
文献类型：
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作者：
D. Basov;B. Dabrowski;T. Timusk
本文报道了高T_c超导体YBa2Cu4O8单晶的光学电导研究，其中的超导电性是由铜被锌随机取代而被抑制的。A轴红外光谱是对CuO2面内电荷动力学的直接测量，在o120 cm21处受束缚态支配。这表明在锌杂质的驱动下，低能电子态处于局域化的边缘。[S0031-9007(98)07061-6]
We report on a study of the optical conductivity of single crystals of the high-Tc superconductor YBa2Cu4O8 in which superconductivity is suppressed by random substitution of Cu with Zn. The a-axis infrared spectrum, which is a direct measure of the charge dynamics in the CuO2 planes, is dominated by a bound state at o120 cm21. This indicates that the low-energy electronic states are on the verge of localization driven by the Zn impurities. [S0031-9007(98)07061-6]