FeSc₂S₄自旋轨道液态中的振动-电子和磁激发。

Vibronic and magnetic excitations in the spin-orbital liquid state of FeSc2S4.

作者信息

Krimmel A, Mücksch M, Tsurkan V, Koza M M, Mutka H, Loidl A

机构信息

Experimentalphysik V, Center for Electronic Correlations and Magnetism, Universität Augsburg, D-86159 Augsburg, Germany.

出版信息

Phys Rev Lett. 2005 Jun 17;94(23):237402. doi: 10.1103/PhysRevLett.94.237402. Epub 2005 Jun 16.

DOI:10.1103/PhysRevLett.94.237402

PMID:16090501

Abstract

Inelastic neutron scattering results on the spin-orbital liquid in FeSc2S4 are presented. This sulfospinel reveals strong geometric frustration in the spin and in the orbital sector. In the present experiments the orbital liquid is evidenced by a clear spectroscopic signature of a dynamic Jahn-Teller effect with a vibronic splitting 3Gamma approximately 2 meV in agreement with theoretical estimates. The excitations of the spin liquid reveal strong dispersion and can be characterized as cooperative spin excitations in a supercooled paramagnet with a spin gap of Delta approximately 0.2 meV.

摘要

给出了关于FeSc₂S₄中自旋轨道液体的非弹性中子散射结果。这种硫代尖晶石在自旋和轨道部分表现出强烈的几何阻挫。在当前实验中，轨道液体由动态 Jahn-Teller 效应的清晰光谱特征所证实，其振动电子分裂 3Γ 约为 2 毫电子伏特，与理论估计相符。自旋液体的激发表现出强烈的色散，并且可被表征为具有约 0.2 毫电子伏特自旋能隙的过冷顺磁体中的协同自旋激发。