FEMTOSECOND DYNAMICS OF QUASI-PARTICLES IN YBA2CU3O7-DELTA SUPERCONDUCTOR FILMS

被引：13

作者：

HAN, SG ^{[1
]}

VARDENY, ZV ^{[1
]}

SYMKO, OG ^{[1
]}

KOREN, G ^{[1
]}

机构：

[1] TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

D O I：

10.1109/20.133479

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have studied the transient electronic response of YBa2Cu3O7-delta epitaxialy grown HT(c) superconductor thin films in the femtosecond time domain, using transient photoinduced reflectivity (DELTA-R) with 60 fsec time resolution. For temperatures T > T(c) only a bolometric signal was observed with DELTA-R > 0. For T < T(c), DELTA-R < 0 with a temperature dependent rise time of order 300 fsec followed by a relaxation (of order 3 psec) into a state with DELTA-R > 0. The results for T < T(c) are explained in terms of quasi-particle (QP) electronic response giving DELTA-R < 0. Thus the femtosecond rise time is interpreted as avalanche multiplication of QP across the gap 2-DELTA and the subsequent picosecond relaxation as QP recombination. The QP optical response is explained within the two fluid model.

引用

页码：1548 / 1551

页数：4

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