Observation of a 500 meV collective mode in La2-xSrxCuO4 and Nd2CuO4 using resonant inelastic x-ray scattering

被引：94

作者：

Hill, J. P. ^{[1
,2
]}

Blumberg, G. ^{[3
]}

Kim, Young-June ^{[4
]}

Ellis, D. S. ^{[4
]}

Wakimoto, S. ^{[4
]}

Birgeneau, R. J. ^{[4
]}

Komiya, Seiki ^{[5
]}

Ando, Yoichi ^{[5
]}

Liang, B. ^{[6
]}

Greene, R. L. ^{[6
]}

Casa, D. ^{[7
]}

Gog, T. ^{[7
]}

机构：

[1] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

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

[3] Bell Labs, Murray Hill, NJ 07974 USA

[4] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[5] Cent Res Inst Elect Power Ind, Tokyo 2018511, Japan

[6] Univ Maryland, Dept Phys, Ctr Supercond Res, College Pk, MD 20742 USA

[7] Argonne Natl Lab, CMC XOR, Adv Photon Source, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.100.097001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Utilizing resonant inelastic x-ray scattering, we report a previously unobserved mode in the excitation spectrum of La2-xSrxCuO4 and Nd2CuO4 at 500 meV. The mode is peaked around the (pi, 0) point in reciprocal space and is observed to soften, and broaden, away from this point. Samples with x=0, 0.01, 0.05, and 0.17 were studied. The new mode is found to be rapidly suppressed with increasing Sr content and is absent at x=0.17, where it is replaced by a continuum of excitations. This mode is only observed when the incident x-ray polarization is normal to the CuO planes.

引用

页数：4

共 32 条

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