Normal-state transport properties of slightly overdoped YBa2Cu3Oy crystals prepared by a crystal-pulling technique

被引:47
作者
Terasaki, I
Sato, Y
Miyamoto, S
Tajima, S
Tanaka, S
机构
[1] Superconductivity Research Laboratory, International Superconductivity Technology Center, Koto-ku, Tokyo 135
[2] Department of Physics, Tokai University, Hiratsuka 259-11
来源
PHYSICAL REVIEW B | 1995年 / 52卷 / 22期
关键词
D O I
10.1103/PhysRevB.52.16246
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Anisotropic transport properties of high-temperature superconductors were extensively investigated for YBa2Cu3Oy crystals prepared by a crystal-pulling technique. Since the crystals are as large as 4X4x2 mm(3), we have successfully measured their resistivity, Hall coefficient, and thermopower along both the in-plane and out-of-plane directions, by using samples cut from the same crystal. The measured in-plane data have revealed that our samples are slightly overdoped when highly oxygenated. This means that our samples have the least anisotropic resistivities between the in-plane and out-of-plane directions among high-T-c cuprates. The Hall coefficient and the thermopower along the out-of-plane direction qualitatively agree with the band calculation, but the scattering time along the out-of-plane direction is anomalously short. Thus, it is concluded that the two-dimensional nature in the electronic states of high-T-c cuprates is mainly characterized by the anomalously short scattering time along the out-of-plane direction, not by the anisotropic effective masses.
引用
收藏
页码:16246 / 16254
页数:9
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