Electronic properties of Sc5 M4 Si10 (M=Co,Rh,Ir) probed by NMR and first-principles calculations

Chin-Shan Lue, R. F. Liu, Y. F. Fu, C. Cheng, H. D. Yang

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4 Citations (Scopus)

Abstract

We report a systematic study of Sc45 NMR measurements on the Sc5 Co4 Si10 -type silicides Sc5 M4 Si10 (M=Co,Rh,Ir). From the central transition line shapes, three nonequivalent Sc sites have been identified. We thus measured the Knight shift and spin-lattice relaxation time (T1) for each of the three crystallographic sites. Results of experimental Knight shift and T1 together with theoretical band structure calculations provide evidence that orbital electrons are responsible for the observed shifts as well as the relaxation rates. In addition, we found no correlation between the Fermi-level density of states and the superconducting transition temperature of the studied materials. Further analyses clearly indicate that the effect of electron-phonon coupling plays a significant role for the superconductivity of Sc5 M4 Si10, and these materials should be classified as moderate-coupling superconductors.

Original languageEnglish
Article number115130
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number11
DOIs
Publication statusPublished - 2008 Mar 21

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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