Rare-earth intermetallic compounds at a magnetic instability

H. V. Löhneysen, H. Bartolf, S. Drotziger, C. Pfleiderer, O. Stockert, D. Souptel, W. Löser, G. Behr

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


Rare-earth intermetallic alloys and compounds, in particular those with Ce or Yb, are often close to a magnetic instability. In particular, CeCu 6-xAux has become a prototype heavy-fermion (HF) system where, starting from not magnetically ordered CeCu6, Au doping introduces long-range incommensurate antiferromagnetism for x>xc≈0.1. At the critical concentration xc the system experiences a quantum phase transition (QPT). Here, the unusual magnetic fluctuations probed by inelastic neutron scattering lead to non-Fermi-liquid behavior, i.e. to anomalous low-temperature thermodynamic and transport properties. Hall-effect measurements delineate the "bandstructure" of heavy fermions across the critical concentration xc. While most rare-earth HF compounds have a tendency towards antiferromagnetic order, CeSi1.81 presents one of the comparatively few cases exhibiting ferromagnetic order below Tc=9.5 K. In a search for a ferromagnetic QPT in HF metals, we have studied the pressure dependence of the magnetization and the spontaneously ordered magnetic moment, μS, which vanishes around p≈13 kbar.

Original languageEnglish
Pages (from-to)9-15
Number of pages7
JournalJournal of Alloys and Compounds
StatePublished - 9 Feb 2006
EventProceedings of the Rare Earths'04 in Nara, Japan -
Duration: 7 Nov 200412 Nov 2004


  • Magnetic instability
  • Non-Fermi-liquid behavior
  • Rare-earth


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