Low-energy excitations of the semimetallic one-dimensional S=1/2 antiferromagnet Yb4As3

Citation
B. Schmidt et al., Low-energy excitations of the semimetallic one-dimensional S=1/2 antiferromagnet Yb4As3, PHYSICA B, 300(1-4), 2001, pp. 121-138
Citations number
65
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
0921-4526 → ACNP
Volume
300
Issue
1-4
Year of publication
2001
Pages
121 - 138
Database
ISI
SICI code
0921-4526(200107)300:1-4<121:LEOTSO>2.0.ZU;2-7
Abstract
We investigate a new route to quasi-one-dimensional spin-chain systems whic h originates from the charge-ordering transition out of a homogeneous mixed -valence state. We present evidence that Yb4As3 and P, Sb doped mixed cryst als are well described by this mechanism. Many thermodynamic and low-temper ature transport heavy-fermion-like properties can be explained by the exist ence of low-lying quasi-one-dimensional spin excitations in the Yb3+-chains . The observation of soliton excitations in a transverse external field giv es further support to the existence of spin chains in Yb4As3. We also prese nt recent results on spin-glass behavior at very low temperature caused by the interchain coupling and disorder. In addition, the yet unexplained magn eto transport effects are discussed. (C) 2001 Elsevier Science B.V. All rig hts reserved.