Journal
SCIENCE
Volume 331, Issue 6015, Pages 316-319Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1197531
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Funding
- Japan Society for the Promotion of Science [21684019]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [19052003, 20102007, 21102507]
- NSF [DMR-NSF-0907179]
- Global Centers of Excellence Program, MEXT, Japan
- Toray Science and Technology Grant
- Grants-in-Aid for Scientific Research [19052003, 20244053, 21102507, 21684019] Funding Source: KAKEN
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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 by 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 that is indicative of zero-field quantum criticality without tuning in a metal. The breakdown of Fermi liquid behavior takes place in a mixed-valence state, which is in sharp contrast with other known examples of quantum critical f-electron systems that are magnetic Kondo lattice systems with integral valence.
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