$^{11}$B Nuclear Magnetic Resonance Measurements of Antiferromagnetic HoB$_{4}$ Single Crystals

POSTER

Abstract

$^{11}$B nuclear magnetic resonance (NMR) measurements have been performed on single crystals of HoB$_{4}$ to investigate local electronic structures and $4f$ spin dynamics. $^{11}$B NMR spectrum, Knight shift, spin-lattice and spin-spin relaxation rates were measured in the temperature range of 3.5 - 300 K under magnetic field of 8 T. $^{11}$B NMR shift and linewidth are huge and strongly temperature-dependent due to $4f$ moments of Ho. The spin-lattice relaxation rate $1/T_{1}$ is independent of temperature above $T_{N }$=8 K whereas it decreases significant below $T_{N}$ indicating huge suppression of $4f$ spin fluctuation. Also the spin-spin relaxation rate $1/T_{2}$ shows similar behavior characteristic of $4f$ electronic spin dynamics change associated with antiferromagnetic ordering.

Authors

  • J.H. Kim

    • Konkuk University, Seoul 143-701 Korea

  • B.J. Mean

    • Konkuk University, Seoul 143-701 Korea

  • K.H. Kang

    • Konkuk University, Seoul 143-701 Korea

  • I.N. Hyun

    • Konkuk University, Seoul 143-701 Korea

  • S.K. Kwon

    • Konkuk University, Seoul 143-701 Korea

  • S.K. Nam

    • Konkuk University, Seoul 143-701 Korea

  • S.H. Choi

    • Konkuk University, Seoul 143-701 Korea

  • S.H. Kim

    • Konkuk University, Seoul 143-701 Korea

  • Moohee Lee

    • Konkuk University, Seoul 143-701 Korea

  • B.K. Cho

    • GIST, Gwangju 500-712 Korea

  • J.H. Cho

    • Hangyoung FLHS, Seoul 134-710 Korea