Effect of random antiferromagnetic exchange on the spin waves in a three-dimensional Heisenberg ferromagnet

被引：0

作者：

Hameed, S. ^{[1
,5
]}

Wang, Z. ^{[1
,6
,7
]}

Gautreau, D. M. ^{[1
,2
]}

Joe, J. ^{[1
]}

Olson, K. P. ^{[2
,8
]}

Chi, S. ^{[3
]}

Gehring, P. M. ^{[4
]}

Hong, T. ^{[3
]}

Pajerowski, D. M. ^{[3
]}

Williams, T. J. ^{[3
]}

Xu, Z. ^{[4
]}

Matsuda, M. ^{[3
]}

Birol, T. ^{[2
]}

Fernandes, R. M. ^{[1
]}

Greven, M. ^{[1
]}

机构：

[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[2] Univ Minnesota, Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

[3] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[4] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany

[6] Zhejiang Univ, Ctr Correlated Matter, Hangzhou 310058, Peoples R China

[7] Zhejiang Univ, Sch Phys, Hangzhou 310058, Peoples R China

[8] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60201 USA

来源：

PHYSICAL REVIEW B | 2023年 / 108卷 / 13期

关键词：

TOTAL-ENERGY CALCULATIONS; HEAT-BATH; SEMICONDUCTORS; SIMULATIONS; ALGORITHMS; DYNAMICS;

D O I：

10.1103/PhysRevB.108.134406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron scattering is used to study spin waves in the three-dimensional Heisenberg ferromagnet YTiO3, with spin-spin exchange disorder introduced via La substitution at the Y site. No significant changes are observed in the spin-wave dispersion up to a La concentration of 20%. However, a strong broadening of the spectrum is found, indicative of shortened spin-wave lifetimes. Density-functional theory calculations predict minimal changes in exchange constants as a result of average structural changes due to La substitution, in agreement with the data. The absence of significant changes in the spin-wave dispersion, the considerable lifetime effect, and the reduced ordered magnetic moment previously observed in the La-substituted system are qualitatively captured by an isotropic, nearest-neighbor, three-dimensional Heisenberg ferromagnet model with random antiferromagnetic exchange. We therefore establish Y1-xLaxTiO3 as a model system for the study of antiferromagnetic spin-exchange disorder in a three-dimensional Heisenberg ferromagnet.

引用

页数：6

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