Femtosecond optical absorption studies of nonequilibrium electronic processes in highTcsuperconductors
作者:
J. M. Chwalek,
C. Uher,
J. F. Whitaker,
G. A. Mourou,
J. Agostinelli,
M. Lelental,
期刊:
Applied Physics Letters
(AIP Available online 1990)
卷期:
Volume 57,
issue 16
页码: 1696-1698
ISSN:0003-6951
年代: 1990
DOI:10.1063/1.104140
出版商: AIP
数据来源: AIP
摘要:
We report the results of femtosecond optical transient absorption experiments performed on <m1;&1p>the superconducting compounds YBa2Cu3O7−x(x∼ 0) and Bi2Sr2Ca2Cu3O10+&dgr;(&dgr; ∼ 0) and nonsuperconducting YBa2Cu3O6+y(y<0.4) for sample temperatures ranging from ∼7 K to room temperature. Nonequilibrium heating was found to occur on a subpicosecond time scale. A distinct, dramatic increase in the relaxation time was observed for the superconducting samples as the sample temperature was lowered below the critical temperatures of the respective films. Accompanying the increase in relaxation time was an increase in the peak fractional transmissivity change. No such changes were observed for the nonsuperconducting YBCO sample. We believe the above described behavior is electronic in origin and intimately related to the superconductivity of the compounds.
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