Ultrafast conductivity dynamics in colossal magnetoresistance manganites

被引：140

作者：

Averitt, RD

Lobad, AI

Kwon, C

Trugman, SA

Thorsmolle, VK

Taylor, AJ

机构：

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

[2] Calif State Univ Long Beach, Dept Phys, Long Beach, CA 90840 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.87.017401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ultrafast picosecond measurements of optically induced changes in the absolute conductivity (0.4-1.0 THz) of La0.7M0.3MnO3 thin films (M = Ca, Sr) from 10 K to similar to0.9T(c) reveal a two-component relaxation. A fast, similar to2 ps, conductivity decrease arises from an optically induced modification of the effective phonon temperature. The slower component, related to spin-lattice relaxation, has a lifetime that increases upon approaching T-c from below in accordance with an increasing spin specific heat. We show that, for T much less than T-c, partial derivative sigma/partial derivativeT is primarily determined by thermally disordered phonons while spin fluctuations dominate near T-c.

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页数：4

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共 19 条

[1] Conductivity artifacts in optical-pump THz-probe measurements of YBa2Cu3O7 [J].

Averitt, RD ;

Rodriguez, G ;

Siders, JLW ;

Trugman, SA ;

Taylor, AJ .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 2000, 17 (02) :327-331

[2] Ultrafast spin dynamics in ferromagnetic nickel [J].

Beaurepaire, E ;

Merle, JC ;

Daunois, A ;

Bigot, JY .

PHYSICAL REVIEW LETTERS, 1996, 76 (22) :4250-4253

[3] Two-phase behavior in strained thin films of hole-doped manganites [J].

Biswas, A ;

Rajeswari, M ;

Srivastava, RC ;

Li, YH ;

Venkatesan, T ;

Greene, RL ;

Millis, AJ .

PHYSICAL REVIEW B, 2000, 61 (14) :9665-9668

[4] Infrared studies of a La0.67Ca0.33MnO3 single crystal:: Optical magnetoconductivity in a half-metallic ferromagnet [J].

Boris, AV ;

Kovaleva, NN ;

Bazhenov, AV ;

van Bentum, PJM ;

Rasing, T ;

Cheong, SW ;

Samoilov, AV ;

Yeh, NC .

PHYSICAL REVIEW B, 1999, 59 (02) :R697-R700

[5] 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

[6] Time-resolved optical observation of spin-wave dynamics [J].

Dodge, JS ;

Schumacher, AB ;

Bigot, JY ;

Chemla, DS ;

Ingle, N ;

Beasley, MR .

PHYSICAL REVIEW LETTERS, 1999, 83 (22) :4650-4653

[7] OBSERVATION OF NON-EQUILIBRIUM ELECTRON HEATING IN COPPER [J].

EESLEY, GL .

PHYSICAL REVIEW LETTERS, 1983, 51 (23) :2140-2143

[8] TRANSPORT-MAGNETISM CORRELATIONS IN THE FERROMAGNETIC OXIDE LA0.7CA0.3MNO3 [J].

HUNDLEY, MF ;

HAWLEY, M ;

HEFFNER, RH ;

JIA, QX ;

NEUMEIER, JJ ;

TESMER, J ;

THOMPSON, JD ;

WU, XD .

APPLIED PHYSICS LETTERS, 1995, 67 (06) :860-862

[9] THOUSANDFOLD CHANGE IN RESISTIVITY IN MAGNETORESISTIVE LA-CA-MN-O FILMS [J].

JIN, S ;

TIEFEL, TH ;

MCCORMACK, M ;

FASTNACHT, RA ;

RAMESH, R ;

CHEN, LH .

SCIENCE, 1994, 264 (5157) :413-415

[10] Heat capacity of La1-xSrxMnO3 single crystals in different magnetic states [J].

Khlopkin, MN ;

Panova, GK ;

Shikov, AA ;

Sinyavskii, VF ;

Shulyatev, DA .

PHYSICS OF THE SOLID STATE, 2000, 42 (01) :114-119