Magnetic excitations in the geometric frustrated multiferroic CuCrO2

被引：47
作者：
Frontzek, M. [1 ]
Haraldsen, J. T. [2 ,3 ,4 ]
Podlesnyak, A. [1 ]
Matsuda, M. [1 ]
Christianson, A. D. [1 ]
Fishman, R. S. [4 ]
Sefat, A. S. [4 ]
Qiu, Y. [5 ,6 ]
Copley, J. R. D. [5 ]
Barilo, S. [7 ]
Shiryaev, S. V. [7 ]
Ehlers, G. [1 ]
机构：
[1] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA
[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
[3] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA
[4] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
[5] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
[6] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
[7] Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 09期
基金：
美国国家科学基金会;
关键词：
NEUTRON; ANTIFERROMAGNET;
D O I：
10.1103/PhysRevB.84.094448
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper detailed neutron scattering measurements of the magnetic excitation spectrum of CuCrO2 in the ordered state below T-N1 = 24.2 K are presented. The spectra are analyzed using a model Hamiltonian which includes intralayer exchange up to the next-next-nearest neighbor and interlayer exchange. We obtain a definite parameter set and show that exchange interaction terms beyond the next-nearest neighbor are important to describe the inelastic excitation spectrum. The magnetic ground state structure generated with our parameter set is in agreement with the structure proposed for CuCrO2 from the results of single crystal diffraction experiments previously published. We argue that the role of the interlayer exchange is crucial to understand the incommensurability of the magnetic structure as well as the spin-charge coupling mechanism.
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页数：7
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