Abstract
It is shown that unconventional critical phenomena commonly observed in paramagnetic metals , , and - are naturally explained by the quantum criticality of Yb-valence fluctuations. We construct the mode-coupling theory taking account of local correlation effects of electrons and find that unconventional criticality is caused by the locality of the valence fluctuation mode. We show that measured low-temperature anomalies such as divergence of uniform spin susceptibility with giving rise to a huge enhancement of the Wilson ratio and the emergence of -linear resistivity are explained in a unified way.
- Received 6 April 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.186403
© 2010 The American Physical Society