NMR Study of Two-Gap Superconductivity in Lu

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概要

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• We report ¹⁷⁵Lu and ²⁹Si NMR results of the ternary-iron silicide superconductor, Lu<inf>2</inf>Fe<inf>3</inf>Si<inf>5</inf>, with T_{\text{c}}\sim 6.1 K. We confirm the decrease of the Knight shift and the existence of coherence peak of nuclear spin--lattice relaxation rate, 1/T_{1} of ²⁹Si below T_{\text{c}}, indicating apparently that the superconducting (SC) pairing symmetry is of the spin-singlet. The observed ¹⁷⁵Lu-NMR signals are attributed to the Zeeman split \Phi|{\pm} 1/2\rangle transition under a large nuclear quadrupole interaction. The temperature dependence of 1/T_{1} of ¹⁷⁵Lu obeys a Curie--Weiss behavior in the normal state. In the SC state, 1/T_{1} decreases rapidly, and follows the T_{1}T=\text{const.} relation below T=1 K, which is suggestive of the existence of the residual density of states of the conduction electrons at the Fermi level. This indicates that the small SC gap is completely suppressed even at small field of H<1.3 T, and contributes to the residual Knight shift and 1/T_{1} in the SC state. We speculate that the small and large SC gap are associated with the electron-like (3D-Fermi surface) and the quasi-1D hole-like pocket bands, respectively.

• 2013-06-15

著者

• Tamegai Tsuyoshi

  Department Of Applied Physics The University Of Tokyo

• Nakajima Yasuyuki

  Department Of Applied Physics The University Of Tokyo

• Kumagai Ken-ichi

  Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University

• Kumagai Ken-ichi

  Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

• Saeed Muhammad

  Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

• Nakajima Yasuyuki

  Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

• Wazumi Toshihiro

  Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

• SAEED Muhammad

  Department of Pharmacy, University of Peshawar

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