Spin-excitons in heavy-fermion semimetals

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:400

Article; Proceedings Paper

Riseborough, Peter S.¹  Magalhaes, S. G.² 

[1] Temple Univ, Philadelphia, PA 19122 USA

[2] Univ Fed Fluminense, Rio De Janeiro, Brazil

关键词: Kondo insulators;    Kondo semimetals;    CeFe2Al10;    Spin-excitons;    Quantum critical point;   

DOI  :  10.1016/j.jmmm.2015.07.043

来源: Elsevier

【 摘 要 】

Spin-excitons are sharp and dispersive magnetic fluctuations in paramagnetic semiconductors where the dispersion relation lies within the semiconducting gap. Spin-excitons are found in the vicinity of magnetic quantum critical points in semiconductors, much the same as antiparamagnons are precursor fluctuations for quantum critical points in metals. Here we show that this concept of spin-exciton excitations can be extended to heavy-fermion semimetals and provides a natural explanation of the magnetic modes found by inelastic neutron scattering experiments on paramagnetic CeFe2Al10. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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