Collective Nature of Spin Excitations in Superconducting Cuprates Probed by Resonant Inelastic X-Ray Scattering

被引：87

作者：

Minola, M. ^{[1
]}

Dellea, G. ^{[2
,3
]}

Gretarsson, H. ^{[1
]}

Peng, Y. Y. ^{[2
,3
]}

Lu, Y. ^{[1
]}

Porras, J. ^{[1
]}

Loew, T. ^{[1
]}

Yakhou, F. ^{[4
]}

Brookes, N. B. ^{[4
]}

Huang, Y. B. ^{[5
,6
,7
]}

Pelliciari, J. ^{[5
]}

Schmitt, T. ^{[5
]}

Ghiringhelli, G. ^{[2
,3
]}

Keimer, B. ^{[1
]}

Braicovich, L. ^{[2
,3
]}

Le Tacon, M. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Politecn Milan, CNR, SPIN, CNISM, I-20133 Milan, Italy

[3] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy

[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[5] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[7] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 21期

关键词：

RESOLUTION;

D O I：

10.1103/PhysRevLett.114.217003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We used resonant inelastic x-ray scattering (RIXS) with and without analysis of the scattered photon polarization, to study dispersive spin excitations in the high temperature superconductor YBa2Cu3O6+x over a wide range of doping levels (0.1 <= x <= 1). The excitation profiles were carefully monitored as the incident photon energy was detuned from the resonant condition, and the spin excitation energy was found to be independent of detuning for all x. These findings demonstrate that the largest fraction of the spin-flip RIXS profiles in doped cuprates arises from magnetic collective modes, rather than from incoherent particle-hole excitations as recently suggested theoretically [Benjamin et al. Phys. Rev. Lett. 112, 247002 (2014)]. Implications for the theoretical description of the electron system in the cuprates are discussed.

引用

页数：6

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