FEMTOSECOND SPECTROSCOPIC STUDIES OF THE ULTRAFAST RELAXATION PROCESS IN THE CHARGE-TRANSFER STATE OF INSULATING CUPRATES

被引：50

作者：

MATSUDA, K ^{[1
]}

HIRABAYASHI, I ^{[1
]}

KAWAMOTO, K ^{[1
]}

NABATAME, T ^{[1
]}

TOKIZAKI, T ^{[1
]}

NAKAMURA, A ^{[1
]}

机构：

[1] INT SUPERCOND TECHNOL CTR,SUPERCOND RES LAB,ATSUTA KU,NAGOYA 456,JAPAN

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.50.4097

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the transient absorption spectra of insulating YBa2Cu3Oy and Nd2CuO4 thin films by the pump and probe method from 1.3 to 2.8 eV with a time resolution of 100 fs. For both insulating samples, a bleaching signal with a 0.6-0.9 ps initial decay time was observed in the spectral range of the O2p to Cu3d charge-transfer transition at around 1.8 eV. This initial decay can be explained as a nonradiative transition through the successive emission of magnons having a comparably large energy quantum. In the photon-energy region lower than the bleaching signal, an induced absorption signal is observed. The origin of the induced absorption by pumping pulses has not necessarily been resolved, but the in-gap states induced by the photodoping effect is suggested as a reason.

引用

页码：4097 / 4101

页数：5

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