Measurement of Magnetic Excitations in the Two-Dimensional Antiferromagnetic Sr2CuO2Cl2 Insulator Using Resonant X-Ray Scattering: Evidence for Extended Interactions

被引：98

作者：

Guarise, M. ^{[1
]}

Dalla Piazza, B. ^{[1
]}

Moretti Sala, M. ^{[2
]}

Ghiringhelli, G. ^{[2
]}

Braicovich, L. ^{[2
]}

Berger, H. ^{[1
]}

Hancock, J. N. ^{[3
]}

van der Marel, D. ^{[3
]}

Schmitt, T. ^{[4
]}

Strocov, V. N. ^{[4
]}

Ament, L. J. P. ^{[5
]}

van den Brink, J. ^{[5
]}

Lin, P. -H. ^{[1
]}

Xu, P. ^{[1
]}

Ronnow, H. M. ^{[1
]}

Grioni, M. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

[2] Politecn Milan, Dipartimento Fis, CNR, INFM, I-20133 Milan, Italy

[3] Univ Geneva, Inst Phys Mat Condensee, CH-1211 Geneva, Switzerland

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

[5] Leiden Univ, Inst Lorentz Theoret Phys, NL-2300 RA Leiden, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 15期

关键词：

LAMELLAR COPPER OXIDES; SQUARE-LATTICE; HEISENBERG-ANTIFERROMAGNET; OPTICAL-PROPERTIES; RAMAN-SCATTERING; SPECTRA; LA2CUO4; STATE;

D O I：

10.1103/PhysRevLett.105.157006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measured the momentum dependence of magnetic excitations in the model spin-1/2 2D antiferromagnetic insulator Sr2CuO2Cl2 (SCOC). We identify a single-spin-wave feature and a multimagnon continuum, with different polarization dependences. The spin waves display a large (70 meV) dispersion between the zone-boundary points (pi, 0) and (pi/2, pi/2). Employing an extended t-t'-t ''-U one-band Hubbard model, we find significant electronic hopping beyond nearest-neighbor Cu ions, indicative of extended magnetic interactions. The spectral line shape at (pi, 0) indicates sizable quantum effects in SCOC and probably more generally in the cuprates.

引用

页数：4

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