Ultrafast mid-infrared response of YRa2Cu3O7-δ

被引：162

作者：

Kaindl, RA

Woerner, M

Elsaesser, T ^{[1
]}

Smith, DC

Ryan, JF

Farnan, GA

McCurry, MP

Walmsley, DG

机构：

[1] Max Born Inst Nichtlineare Opt & Kurzzeitspektros, D-12489 Berlin, Germany

[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[3] Queens Univ Belfast, Dept Pure & Appl Phys, Belfast BT7 1NN, Antrim, North Ireland

来源：

SCIENCE | 2000年 / 287卷 / 5452期

关键词：

D O I：

10.1126/science.287.5452.470

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Optical spectra of high-transition-temperature superconductors in the midinfrared display a gap of in-plane conductivity whose role for superconductivity remains unresolved. Femtosecond measurements of the mid-infrared reflectivity of YBa2Cu3O7-delta after nonequilibrium optical excitation are used to demonstrate the ultrafast fill-in of this gap and reveal two gap constituents: a picosecond recovery of the superconducting condensate in underdoped and optimally doped material and, in underdoped YBa2Cu3O7-delta, an additional subpicosecond component related to pseudogap correlations. The temperature-dependent amplitudes of both contributions correlate with the antiferromagnetic 41-millielectronvolt peak in neutron scattering, supporting the coupling between charges and spin excitations.

引用

页码：470 / 473

页数：4

共 22 条

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