Pair-breaking and superconducting state recovery dynamics in MgB2 -: art. no. 267002

被引：112

作者：

Demsar, J

Averitt, RD

Taylor, AJ

Kabanov, VV

Kang, WN

Kim, HJ

Choi, EM

Lee, SI

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Jozef Stefan Inst, Ljubljana, Slovenia

[3] Pohang Univ Sci & Technol, Dept Phys, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.91.267002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present studies of the photoexcited quasiparticle dynamics in MgB2 where, using femtosecond optical techniques, Cooper pair-breaking dynamics (PBD) have been temporally resolved for the first time. The PBD are strongly temperature and photoexcitation intensity dependent. Analysis of the PBD using the Rothwarf-Taylor equations suggests that the anomalous PBD arises from the fact that in MgB2 photoexcitation is initially followed by energy relaxation to high frequency phonons instead of, as commonly assumed, e-e thermalization. Furthermore, the bare quasiparticle recombination rate and the probability for pair breaking by phonons have been determined.

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页码：267002 / 267002

页数：4

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