Magnetic excitations in Kondo liquid: superconductivity and hidden magnetic quantum critical fluctuations

Yang, Yifeng; Urbano, Ricardo; Nicholas, Curro; Pines, David

doi:10.1103/PhysRevLett.103.197004

Title: Magnetic excitations in Kondo liquid: superconductivity and hidden magnetic quantum critical fluctuations

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.103.197004· OSTI ID:970589

Yang, Yifeng ^[1]; Urbano, Ricardo ^[2]; Nicholas, Curro ^[3]; Pines, David ^[3]

Los Alamos National Laboratory
NHMFL, FL
UC DAVIS

We report Knight shift experiments on the superconducting heavy electron material CeCoIn{sub 5} that allow one to track with some precision the behavior of the heavy electron Kondo liquid in the superconducting state with results in agreement with BCS theory. An analysis of the {sup 115}In nuclear quadrupole resonance (NQR) spin-lattice relaxation rate T{sub 1}{sup -1} measurements under pressure reveals the presence of 2d magnetic quantum critical fluctuations in the heavy electron component that are a promising candidate for the pairing mechanism in this material. Our results are consistent with an antiferromagnetic quantum critical point (QCP) located at slightly negative pressure in CeCoIn{sub 5} and provide additional evidence for significant similarities between the heavy electron materials and the high T{sub c} cuprates.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC52-06NA25396

OSTI ID:: 970589

Report Number(s):: LA-UR-09-05977; LA-UR-09-5977; PRLTAO; TRN: US201002%%1300

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters; ISSN 0031-9007

Country of Publication:: United States

Language:: English

References (11)

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Related Subjects

36 MATERIALS SCIENCE
ACCURACY
BCS THEORY
CUPRATES
ELECTRONS
FLUCTUATIONS
KNIGHT SHIFT
NUCLEAR QUADRUPOLE RESONANCE
SPIN-LATTICE RELAXATION
SUPERCONDUCTIVITY

Title: Magnetic excitations in Kondo liquid: superconductivity and hidden magnetic quantum critical fluctuations

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