Anisotropic spin fluctuations and superconductivity in "115'' heavy fermion compounds: 59Co NMR study in PuCoGa5

E.D. Bauer; F. Ronning; H. Sakai; J. A. Kennison; J. D. Thompson; J. N. Mitchell; S.-H. Baek

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Anisotropic spin fluctuations and superconductivity in "115'' heavy fermion compounds: 59Co NMR study in PuCoGa5

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arxiv 1011.4466 v1 pith:BOGBXDQC submitted 2010-11-19 cond-mat.str-el

S.-H. Baek , H. Sakai , E.D. Bauer , J. N. Mitchell , J. A. Kennison , F. Ronning , J. D. Thompson This is my paper · ORCID

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keywords fluctuationsspinanisotropyfermionheavynuclearpucoga5superconductivity

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abstract

We report results of $^{59}$Co nuclear magnetic resonance measurements on a single crystal of superconducting PuCoGa5 in its normal state. The nuclear spin-lattice relaxation rates and the Knight shifts as a function of temperature reveal an anisotropy of spin fluctuations with finite wave vector q. By comparison with the isostructural members, we conclude that antiferromagnetic XY-type anisotropy of spin fluctuations plays an important role in mediating superconductivity in these heavy fermion materials.

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