期刊
SCIENCE
卷 339, 期 6122, 页码 933-936出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1230583
关键词
-
资金
- DFG Research Unit 960 Quantum Phase Transitions
Unconventional superconductivity and other previously unknown phases of matter exist in the vicinity of a quantum critical point (QCP): a continuous phase change of matter at absolute zero. Intensive theoretical and experimental investigations on itinerant systems have shown that metallic ferromagnets tend to develop via either a first-order phase transition or through the formation of intermediate superconducting or inhomogeneous magnetic phases. Here, through precision low-temperature measurements, we show that the Gruneisen ratio of the heavy fermion metallic ferromagnet YbNi4(P0.92As0.08)(2) diverges upon cooling to T = 0, indicating a ferromagnetic QCP. Our observation that this kind of instability, which is forbidden in d-electron metals, occurs in a heavy fermion system will have a large impact on the studies of quantum critical materials.
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