한국초전도학회:학술대회논문집

The Korean Superconductivity Society (한국초전도학회)
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4f spin dynamics in TbNi$_2$B$_2$C by $^{11}$B NMR

  • Lee, K.H. (Department of Physics, Konkuk University) ;
  • Seo, S.W. (Department of Physics, Konkuk University) ;
  • Kim, D.H. (Department of Physics, Konkuk University) ;
  • Khang, K.H. (Department of Physics, Konkuk University) ;
  • Seo, H.S. (Department of Physics, Konkuk University) ;
  • Hwang, C.S. (Department of Physics, Konkuk University) ;
  • Hong, K.S. (Seoul Branch, Korea Basic Science Institute) ;
  • Cho, B.K. (Department of Material Science and Technology) ;
  • Lee, W.C. (Department of Physic. Sook-Myung Women's University) ;
  • Lee, Moo-Hee (Department of Physics, Konkuk University)
  • Published : 2000.08.16
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Abstract

$^{11}$B NMR measurements have been performed to investigate local electronic structure and 4f spin dynamics for TbNi$_2$B$_2$C single crystal. $^{11}$B NMR spectra show three resonance peaks due to the quadrupolar interaction. Shift and linewidth are huge and strongly temperature-dependent. In addition, both are proportional to magnetic susceptibility, indicating that the hyperfine field at the boron site originates from the 4f spins of Tb. $^{11}$B NMR shift and relaxation rates show high anisotropy for field parallel and perpendicular to the c-axis. Anisotropy of the shift and the relaxation rates suggests that the hyperfine field perpendicular to the c-axis is larger.

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