期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 31, 页码 13631-13635出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1005036107
关键词
antiferromagnetism; spin density waves; electric transport
资金
- National Science Foundation (NSF) [DMR-0907025]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0907025] Funding Source: National Science Foundation
The elemental antiferromagnet Cr at high pressure presents a new type of naked quantum critical point that is free of disorder and symmetry-breaking fields. Here we measure magnetotransport in fine detail around the critical pressure, P-c similar to 10 GPa, in a diamond anvil cell and reveal the role of quantum critical fluctuations at the phase transition. As the magnetism disappears and T -> 0, the magntotransport scaling converges to a non-mean-field form that illustrates the reconstruction of the magnetic Fermi surface, and is distinct from the critical scaling measured in chemically disordered Cr:V under pressure. The breakdown of itinerant antiferromagnetism only comes clearly into view in the clean limit, establishing disorder as a relevant variable at a quantum phase transition.
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