Magnons in tetragonal CuO

被引：11

作者：

Moser, S. ^{[1
]}

Shaik, N. E. ^{[1
]}

Samal, D. ^{[2
,3
]}

Fatale, S. ^{[1
]}

Dalla Piazza, B. ^{[1
]}

Dantz, M. ^{[4
]}

Pelliciari, J. ^{[4
]}

Olalde-Velasco, P. ^{[4
]}

Schmitt, T. ^{[4
]}

Koster, G. ^{[2
]}

Mila, F. ^{[5
]}

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

Grioni, M. ^{[1
]}

机构：

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

[2] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[3] Max Planck Inst Solid State Res, DE-70569 Stuttgart, Germany

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

[5] Ecole Polytech Fed Lausanne, Inst Theoret Phys, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 14期

基金：

瑞士国家科学基金会;

关键词：

X-RAY-SCATTERING; HEISENBERG-ANTIFERROMAGNET; ISING TRANSITION; SQUARE-LATTICE; SYMMETRY; OXIDES; COPPER;

D O I：

10.1103/PhysRevB.92.140404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate by resonant inelastic x-ray scattering the magnetic excitations in thin films of tetragonal CuO. We identify a spin wave excitation, dispersing on two cupratelike antiferromagnetic sublattices. Its energy at the boundary of the Brillouin zone (220 meV), is significantly lower than typical values (E similar to 300 meV) found in two-dimensional cuprates. A spin wave expansion starting from an extended Hubbard model suggests two possible scenarios for this energy lowering.

引用

页数：5

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