ULTRAFAST NONEQUILIBRIUM CARRIER RELAXATION IN SINGLE-CRYSTAL ND1.85CE0.15CUO4-Y

被引：20

作者：

LIU, YQ ^{[1
]}

WHITAKER, JF ^{[1
]}

UHER, C ^{[1
]}

PENG, JL ^{[1
]}

LI, ZY ^{[1
]}

GREENE, RL ^{[1
]}

机构：

[1] UNIV MARYLAND,CTR SUPERCONDUCT RES,COLL PK,MD 20742

来源：

APPLIED PHYSICS LETTERS | 1993年 / 63卷 / 07期

关键词：

D O I：

10.1063/1.109864

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a temperature-dependent investigation of the femtosecond relaxation dynamics of the n-type superconductor Nd1.85Ce0.15CuO4-y using ultrashort pulses from a Ti-sapphire laser in a transient absorption, pump-probe configuration. The energy relaxation time of the single crystals in the normal state was observed to increase by over an order of magnitude as the critical temperature was approached. This behavior has been modeled by the scattering of electrons with two-dimensional phonons. In the superconducting state, an increase and subsequent saturation of the relaxation time has been discerned. A possible reason for this is a complex interplay among the characteristic relaxation times, including scattering and recombination of quasiparticles optically excited by ultrashort laser pulses and order parameter relaxation close to T(c).

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页码：979 / 981

页数：3

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