Quantum critical fluctuations in heavy fermion compounds

A. Schroeder, G. Aeppli, P. Coleman, R. Ramazashvili, R. Coldea, M. Adams, E. Bucher, D. F. Mcmorrow, H. V. Löhneysen, O. Stockert

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The electronic properties of heavy fermion alloys are dominated by spin fluctuations which are expected to become critical when tuned by pressure to a quantum critical point (QCP), entering a magnetic ordered state. Apart from the onset of exotic superconductivity, unexpected "normal conducting" behavior is found close to the QCP, which does not seem only to escape the conventional view of metals (Fermi liquids) but also the "conventional view" of an antiferromagnetic quantum phase transition in these f-metals. So far only few compounds have been investigated by neutron scattering to directly reveal the critical fluctuations spectrum. In CeCu59Au01 the fluctuations develop an unusual energy dependence, characterized by an exponent α = 0.75, which persist over the entire Brillouin zone, provoking an unexpected local non Fermi liquid behavior. The same unusual exponent derived from E/T scaling determines the H/T scaling of the uniform magnetization. Recent neutron scattering data in magnetic fields further confirm this picture of nearly free local magnetic moments (modified by α) emerging at the antiferromagnetic QCP in this strongly correlated electron system.

Original languageEnglish (US)
Pages (from-to)3031-3036
Number of pages6
JournalInternational Journal of Modern Physics B
Issue number20-22
StatePublished - Aug 30 2002

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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