Polarized-neutron study of spin dynamics in the Kondo insulator YbB12

被引:46
|
作者
Nemkovski, K. S. [1 ]
Mignot, J.-M.
Alekseev, P. A.
Ivanov, A. S.
Nefeodova, E. V.
Rybina, A. V.
Regnault, L.-P.
Iga, F.
Takabatake, T.
机构
[1] Russian Res Ctr, LNSR, ISSSP, IV Kurchatov Atom Energy Inst, Moscow 123182, Russia
[2] CEA Saclay, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[4] CEA, DRFMC, SPSMS, F-38054 Grenoble 9, France
[5] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398530, Japan
关键词
D O I
10.1103/PhysRevLett.99.137204
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Inelastic neutron scattering experiments have been performed on the archetype compound YbB12, using neutron polarization analysis to separate the magnetic signal from the phonon background. With decreasing temperature, components characteristic for a single-site spin-fluctuation dynamics are suppressed, giving place to specific, strongly Q-dependent, low-energy excitations near the spin-gap edge. This crossover is discussed in terms of a simple crystal-field description of the incoherent high-temperature state and a predominantly local mechanism for the formation of the low-temperature singlet ground state.
引用
收藏
页数:4
相关论文
共 50 条
  • [31] Yb–Yb correlations and crystal field in the Kondo-insulator YbB12
    P.A. Alekseev
    J.-M. Mignot
    K.S. Nemkovski
    R. Kahn
    N.Yu. Shitsevalova
    R.I. Bewley
    R.S. Eccleston
    E.S. Clementyev
    V.N. Lazukov
    E.V. Nefeodova
    I.P. Sadikov
    N.N. Tiden
    Applied Physics A, 2002, 74 : s562 - s564
  • [32] Temperature-dependent high-resolution photoemission study of the Kondo insulator YbB12
    Susaki, T
    Takeda, Y
    Arita, M
    Mamiya, K
    Fujimori, A
    Shimada, K
    Namatame, H
    Taniguchi, M
    Shimizu, N
    Iga, F
    Takabatake, T
    PHYSICAL REVIEW LETTERS, 1999, 82 (05) : 992 - 995
  • [33] High resolution soft X-ray photoernission of Kondo insulator YbB12
    Shigemoto, A
    Imada, S
    Sekiyama, A
    Yamasaki, A
    Irizawa, A
    Muro, T
    Saitoh, Y
    Iga, F
    Takabatake, T
    Suga, S
    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 2005, 144 : 671 - 673
  • [34] Evolution of the magnetic excitation spectra of the YbB12 Kondo insulator under variations in temperature
    Nemkovski, K. S.
    Alekseev, P. A.
    Mignot, J.-M.
    Sadikov, I. P.
    CRYSTALLOGRAPHY REPORTS, 2007, 52 (03) : 393 - 397
  • [35] Yb-Yb correlations and crystal field in the Kondo-insulator YbB12
    Alekseev, PA
    Mignot, JM
    Nemkovski, KS
    Kahn, R
    Shitsevalova, NY
    Bewley, RI
    Eccleston, RS
    Clementyev, ES
    Lazukov, VN
    Nefeodova, E
    Sadikov, IP
    Tiden, NN
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2002, 74 (Suppl 1): : S562 - S564
  • [36] Evolution of the magnetic excitation spectra of the YbB12 kondo insulator under variations in temperature
    K. S. Nemkovski
    P. A. Alekseev
    J. -M. Mignot
    I. P. Sadikov
    Crystallography Reports, 2007, 52 : 393 - 397
  • [37] High resolution soft X-ray photoemission of kondo insulator YbB12
    Shigemoto, A.
    Yamaguchi, J.
    Imada, S.
    Sekiyama, A.
    Yamasaki, A.
    Irizawa, A.
    Muro, T.
    Iga, F.
    Takabatake, T.
    Suga, S.
    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 2007, 156 : CIV - CIV
  • [38] Robust hybridization gap in the Kondo insulator YbB12 probed by femtosecond optical spectroscopy
    Pokharel, A. R.
    Agustsson, S. Y.
    Kabanov, V. V.
    Iga, F.
    Takabatake, T.
    Okamura, H.
    Demsar, J.
    PHYSICAL REVIEW B, 2021, 103 (11)
  • [39] Divalent ion substitution effect on Yb-site in Kondo insulator YbB12
    Matsuhra, W.
    Yokomichi, K.
    Hirano, W.
    Kikuchi, S.
    Uematsu, N.
    Nakayama, H.
    Kondo, A.
    Kindo, K.
    Iga, F.
    AIP ADVANCES, 2018, 8 (10)
  • [40] Interplay of low-energy phonons and magnetic excitations in the Kondo insulator YbB12
    Alekseev, P. A.
    Mignot, J-M
    Nemkovski, K. S.
    Rybina, A. V.
    Lazukov, V. N.
    Ivanov, A. S.
    Iga, F.
    Takabatake, T.
    JOURNAL OF PHYSICS-CONDENSED MATTER, 2012, 24 (20)