Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-01-22
Science 331, 316 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
26 pages, 7 figures including supporting online matelials
Scientific paper
10.1126/science.1197531
Fermi liquid theory, the standard theory of metals, has been challenged by a number of observations of anomalous metallic behavior found in the vicinity of a quantum phase transition. The breakdown of the Fermi liquid is accomplished by fine-tuning the material to a quantum critical point using a control parameter such as the magnetic field, pressure, or chemical composition. Our high precision magnetization measurements of the ultrapure f-electron based superconductor {\beta}-YbAlB4 demonstrate a scaling of its free energy indicative of zero-field quantum criticality without tuning in a metal. The breakdown of Fermi-liquid behavior takes place in a mixed-valence state, in sharp contrast with other known examples of quantum critical f-electron systems that are magnetic Kondo lattice systems with integral valence.
Coleman Piers
Horie Naoki
Karaki Yoshitomo
Kuga Kentaro
Matsumoto Yosuke
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