期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 18, 页码 7160-7164出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1305240110
关键词
Kondo lattice; Kondo breakdown; gyromagnetic factor; composite pairing
资金
- National Science Foundation [DMR-1006606, DMR-0844115]
- Institute for Complex Adaptive Matter Branches Cost Sharing Fund
- Ohio Board of Regents Grant at Kent State University [OBR-RIP-220573]
- Department of Energy at University of California at San Diego [DE-FG02-04ER46105]
- Alexander von Humboldt Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006606] Funding Source: National Science Foundation
One of the greatest challenges to Landau's Fermi liquid theory-the standard theory of metals-is presented by complex materials with strong electronic correlations. In these materials, non-Fermi liquid transport and thermodynamic properties are often explained by the presence of a continuous quantum phase transition that happens at a quantum critical point (QCP). A QCP can be revealed by applying pressure, magnetic field, or changing the chemical composition. In the heavy-fermion compound CeCoIn5, the QCP is assumed to play a decisive role in defining the microscopic structure of both normal and superconducting states. However, the question of whether a QCP must be present in the material's phase diagram to induce non-Fermi liquid behavior and trigger superconductivity remains open. Here, we show that the full suppression of the field-induced QCP in CeCoIn5 by doping with Yb has surprisingly little impact on both unconventional superconductivity and non-Fermi liquid behavior. This implies that the non-Fermi liquid metallic behavior could be a new state of matter in its own right rather than a consequence of the underlying quantum phase transition.
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