TEMPORAL RELAXATION OF NONEQUILIBRIUM IN Y-BA-CU-O MEASURED FROM TRANSIENT PHOTOIMPEDANCE RESPONSE

被引:86
作者
BLUZER, N
机构
[1] Westinghouse Advanced Technology Division, Baltimore
来源
PHYSICAL REVIEW B | 1991年 / 44卷 / 18期
关键词
D O I
10.1103/PhysRevB.44.10222
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nonequilibrium in Y-Ba-Cu-0 thin films biased with a dc current is photoinduced by exposure to 300-fsec 2-eV laser pulses. The photoinduced nonequilibrium transients were measured in the superconducting, transition, and normal states occurring between 7 and 200 K. The photoabsorption produced temporal changes in the sample's impedance, which manifest themselves as transient voltage signals occurring across the samples during the nonequilibrium's relaxation process. At and above T(c), the observed photoresponse is thermal. Below T(c), a quantum response is obtained corresponding to changes in the Cooper-pair populations. In the zero-resistance superconducting state, a positive signal corresponds to quasiparticle generation and a negative signal corresponds to quasiparticle recombination.
引用
收藏
页码:10222 / 10233
页数:12
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