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

B. Schmidt, H. Aoki, T. Cichorek, J. Custers, P. Gegenwart, M. Kohgi, M. Lang, C. Langhammer, A. Ochiai, S. Paschen, F. Steglich, T. Suzuki, P. Thalmeier, B. Wand, A. Yaresko

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


We investigate a new route to quasi-one-dimensional spin-chain systems which originates from the charge-ordering transition out of a homogeneous mixed-valence state. We present evidence that Yb4As3 and P, Sb doped mixed crystals are well described by this mechanism. Many thermodynamic and low-temperature transport heavy-fermion-like properties can be explained by the existence of low-lying quasi-one-dimensional spin excitations in the Yb3+-chains. The observation of soliton excitations in a transverse external field gives further support to the existence of spin chains in Yb4As3. We also present recent results on spin-glass behavior at very low temperature caused by the interchain coupling and disorder. In addition, the yet unexplained magnetotransport effects are discussed.

Original languageEnglish
Pages (from-to)121-138
Number of pages18
JournalPhysica B: Condensed Matter
Issue number1-4
Publication statusPublished - 2001 Jul 1
Externally publishedYes


  • Antiferromagnets
  • Low-energy excitations
  • Semimetals
  • YbAs

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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