Hall number in YbRh_2Si_2

  • Norman M
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Abstract

Recent experimental studies have revealed an abrupt change in the
Hall number at a field tuned quantum critical point in the heavy
fermion magnet YbRh2Si2. We investigate this by calculating the local
density band structure for this metal and the appropriate transport
integrals. We find the Fermi surface to be multisheeted with the
two largest sheets having opposite sign contributions to the Hall
number. Small changes in the f electron occupation are sufficient
to reproduce the observed large change in the Hall number. This suggests
that YbRh2Si2 may be an example of a quantum critical valence fluctuator.

Author-supplied keywords

  • QUANTUM CRITICAL-POINT; F-ELECTRON METALS; PHASE-T

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Authors

  • M R Norman

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