Evidence for s-Wave Superconductivity with Antiferromagnetic Fluctuations in Filled Skutterudite LaFe4P12: 139La and 31P-NMR Studies

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  • Nakai Yusuke
    Department of Physics, Graduate School of Science, Kyoto University
  • Ishida Kenji
    Department of Physics, Graduate School of Science, Kyoto University
  • Kikuchi Daisuke
    Graduate School of Science, Tokyo Metropolitan University
  • Sugawara Hitoshi
    Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Sato Hideyuki
    Graduate School of Science, Tokyo Metropolitan University

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  • Evidence for <i>s</i>-Wave Superconductivity with Antiferromagnetic Fluctuations in Filled Skutterudite LaFe<sub>4</sub>P<sub>12</sub>: <sup>139</sup>La and <sup>31</sup>P-NMR Studies

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We have performed 139La,31P-NMR studies on a filled skutterudite superconductor LaFe4P12 with the critical temperature Tc=4.1 K. In the normal state, the presence of antiferromagnetic (AFM) fluctuations at finite wave vectors is suggested from the relation between the nuclear spin-lattice relaxation rate 1⁄T1 and the Knight shift. In the superconducting (SC) state, the distinct coherence peak is observed just below Tc, and is easily suppressed by applied fields. An exponential decrease of 1⁄T1 is observed, suggestive of the isotropic SC gap with 2Δ⁄(kBTc)=3.8. Besides, we observed the decrease of the Knight shift, indicative of the singlet-pair formation below Tc. These results are clear evidence that LaFe4P12 is a rare s-wave superconductor with significant AFM fluctuations.

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