Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2O

被引：9

作者：

Chang, Hun ^{[1
]}

Hwang, In-Yong ^{[1
]}

Chung, Jae-Ho ^{[1
]}

Stewart, J. Ross ^{[2
]}

Higemoto, Wataru ^{[3
,4
]}

Miyake, Yasuhiro ^{[5
]}

机构：

[1] Korea Univ, Dept Phys, Seoul 02841, South Korea

[2] ISIS Facil, Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[3] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[4] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1520081, Japan

[5] High Energy Accelerator Res Org, KEK, Tokai, Ibaraki 3191106, Japan

来源：

PHYSICAL REVIEW B | 2018年 / 97卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

LATTICES; PHASE;

D O I：

10.1103/PhysRevB.97.014406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the temperature-dependent evolution of spin ordering and excitations of the frustrated tetragonal (c >a) spinel ZnMn2O4 across the two-dimensional antiferromagnetic transition. Muon spin relaxation indicates full development of ordered magnetic moments immediately below T-N = 62.7(2) K in spite of the apparent low-dimensional ordering. Using inelastic neutron scattering, we obtained the spin Hamiltonian accounting for the temperature-dependent spin excitations. The damped spin waves at high temperature exhibit a continuous increase in their lifetime on cooling across T-N. In contrast, the finite anisotropy gap appears suddenly below T-N indicating that single-ion anisotropy stabilizes the antiferromagnetic chains. We also observed the frustrated out-of-plane exchange contributing to the high-energy modes.

引用

页数：7

共 33 条

[1] MAGNETIC STRUCTURES IN SPINEL B-SITE LATTICES - A PROPOSAL OF LINEAR ANTIFERROMAGNETISM IN ZNMN2O4 [J].