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

相关论文

共 32 条

[1] THEORY OF THERMAL RELAXATION OF ELECTRONS IN METALS [J].

ALLEN, PB .

PHYSICAL REVIEW LETTERS, 1987, 59 (13) :1460-1463

[2] Ultrafast conductivity dynamics in colossal magnetoresistance manganites [J].

Averitt, RD ;

Lobad, AI ;

Kwon, C ;

Trugman, SA ;

Thorsmolle, VK ;

Taylor, AJ .

PHYSICAL REVIEW LETTERS, 2001, 87 (01)

[3] Nonequilibrium superconductivity and quasiparticle dynamics in YBa2Cu3O7-δ -: art. no. 140502 [J].

Averitt, RD ;

Rodriguez, G ;

Lobad, AI ;

Siders, JLW ;

Trugman, SA ;

Taylor, AJ .

PHYSICAL REVIEW B, 2001, 63 (14)

[4] Phenomenological two-gap model for the specific heat of MgB [J].

Bouquet, F ;

Wang, Y ;

Fisher, RA ;

Hinks, DG ;

Jorgensen, JD ;

Junod, A ;

Phillips, NE .

EUROPHYSICS LETTERS, 2001, 56 (06) :856-862

[5] FEMTOSECOND ROOM-TEMPERATURE MEASUREMENT OF THE ELECTRON-PHONON COUPLING CONSTANT-LAMBDA IN METALLIC SUPERCONDUCTORS [J].

BRORSON, SD ;

KAZEROONIAN, A ;

MOODERA, JS ;

FACE, DW ;

CHENG, TK ;

IPPEN, EP ;

DRESSELHAUS, MS ;

DRESSELHAUS, G .

PHYSICAL REVIEW LETTERS, 1990, 64 (18) :2172-2175

[6] Boron isotope effect in superconducting MgB2 [J].

Bud'ko, SL ;

Lapertot, G ;

Petrovic, C ;

Cunningham, CE ;

Anderson, N ;

Canfield, PC .

PHYSICAL REVIEW LETTERS, 2001, 86 (09) :1877-1880

[7] Exploring the dynamics of superconductors by time-resolved far-infrared spectroscopy [J].

Carr, GL ;

Lobo, RPSM ;

LaVeigne, J ;

Reitze, DH ;

Tanner, DB .

PHYSICAL REVIEW LETTERS, 2000, 85 (14) :3001-3004

[8] The origin of the anomalous superconducting properties of MgB2 [J].

Choi, HJ ;

Roundy, D ;

Sun, H ;

Cohen, ML ;

Louie, SG .

NATURE, 2002, 418 (6899) :758-760

[9] Quasiparticle relaxation dynamics in heavy fermion compounds [J].

Demsar, J ;

Averitt, RD ;

Ahn, KH ;

Graf, MJ ;

Trugman, SA ;

Kabanov, VV ;

Sarrao, JL ;

Taylor, AJ .

PHYSICAL REVIEW LETTERS, 2003, 91 (02)

[10] Superconducting gap Δc, the pseudogap Δp, and pair fluctuations above Tc in overdoped Y1-xCaxBa2Cu3O7-δ from femtosecond time-domain spectroscopy [J].

Demsar, J ;

Podobnik, B ;

Kabanov, VV ;

Wolf, T ;

Mihailovic, D .

PHYSICAL REVIEW LETTERS, 1999, 82 (24) :4918-4921

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