KOSTERLITZ-THOULESS TRANSITION IN AN YBA2CU3O7/PRBA2CU3O7 SUPERLATTICE

被引：3
作者：
QIU, XG
ZHAO, BR
GUO, SQ
ZHANG, JL
LI, L
机构：
[1] National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing
来源：
PHYSICA C | 1992年 / 197卷 / 3-4期
关键词：
D O I：
10.1016/0921-4534(92)90002-T
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A systematic study of the electrical transport properties was carried out in a YBa2Cu3O7/PrBa2Cu3O7 (48 angstrom/100 angstrom) superlattice sample. The resistance above the temperature T(KT) showed an exponential inverse-square-root temperature dependence. Below the temperature T(KT), the current-voltage characteristics in the low-current limit obeyed a power law relationship, and the universal jump of the exponent pi-K(R) from 2 to 0 was observed around T(KT). All these phenomena are consistent with the Kosterlitz-Thouless theory. The large KT transition parameter tau(KT) = (T(c0) - T(KT))/T(KT) implies an enhancement of two-dimensionality in the superlattice.
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页码：195 / 200
页数：6
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