Spin dynamics in the distorted triangular lattice antiferromagnet α-SrCr2O4

被引：3

作者：

Songvilay, M. ^{[1
,2
]}

Petit, S. ^{[1
]}

Suard, E. ^{[3
]}

Martin, C. ^{[4
]}

Damay, F. ^{[1
]}

机构：

[1] CEA, CNRS, UMR 12, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[2] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] Inst Laue Langevin, BP156,71 Ave Martyrs, F-38000 Grenoble, France

[4] CNRS, UMR 6508, Lab CRISMAT, 6 Blvd Marechal Juin, F-14050 Caen, France

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.96.024416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin dynamics in the distorted triangular lattice antiferromagnet alpha-SrCr2O4 has been investigated by inelastic neutron scattering on a single crystal. The spin wave dispersion has been mapped out in the (0 k l) and (h k 0) planes, and modeled by spin wave calculations, in order to determine the intraplane and interplane exchange couplings. Comparison with alpha-CaCr2O4 shows that, despite the smaller lattice distortion of alpha-SrCr2O4, the deviation from a perfect triangular lattice still affects the spin dynamics of the Sr compound, with a soft mode, similar to the one observed in the Ca counterpart, being observed in (020). Although alpha-SrCr2O4 is further away from a magnetic phase boundary than its Ca counterpart, its dynamic magnetic properties still show intriguing features, which are discussed as quantum fluctuations arising from a two-magnon continuum.

引用

页数：8

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