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
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 13期
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
  • [1] Spin excitations in Kondo insulator YbB12
    Barabanov, A. F.
    Maksimov, L. A.
    PHYSICS LETTERS A, 2009, 373 (20) : 1787 - 1790
  • [2] Lattice dynamics in the kondo insulator YbB12
    Nemkovski, K. S.
    Alekseev, P. A.
    Mignot, J. -M.
    Rybina, A. V.
    Iga, F.
    Takabatake, T.
    Shitsevalova, N. Yu.
    Paderno, Yu. B.
    Lazukov, V. N.
    Nefeodova, E. V.
    Tiden, N. N.
    Sadikov, I. P.
    JOURNAL OF SOLID STATE CHEMISTRY, 2006, 179 (09) : 2895 - 2899
  • [3] Photoemission study of Kondo insulator YbB12
    Susaki, T
    Takeda, Y
    Arita, M
    Fujimori, A
    Shimada, K
    Namatame, H
    Taniguchi, M
    Hiura, S
    Iga, F
    Takabatake, T
    PHYSICA B, 2000, 281 : 282 - 283
  • [4] Phonons in the Kondo insulator YbB12
    Nemkovski, KS
    Alekseev, PA
    Mignot, JM
    Tiden, NN
    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL. 1, NO. 11, 2004, 1 (11): : 3093 - 3096
  • [5] Vibrational spectra of the YbB12 Kondo insulator
    A. V. Rybina
    P. A. Alekseev
    K. S. Nemkovski
    E. V. Nefeodova
    J. -M. Mignot
    Yu. B. Paderno
    N. Yu. Shitsevalova
    R. I. Bewley
    Crystallography Reports, 2007, 52 : 770 - 773
  • [6] Neutron scattering study of spin and lattice dynamics in YbB12
    Mignot, J. -M.
    Alekseev, P. A.
    Nemkovski, K. S.
    Nefeodova, E. V.
    Rybina, An.
    Regnault, L. -P.
    Shitsevalova, N. Yu.
    Iga, F.
    Takabatake, T.
    PHYSICA B-CONDENSED MATTER, 2006, 383 (01) : 16 - 19
  • [7] Asymmetric Anderson model and spin excitations in the Kondo insulator YbB12
    A. F. Barabanov
    L. A. Maksimov
    Journal of Experimental and Theoretical Physics, 2009, 109 : 95 - 102
  • [8] Phonon Raman scattering study of a Kondo insulator YbB12
    Fujita, Y
    Ogita, N
    Shimizu, N
    Iga, F
    Takabatake, T
    Udagawa, M
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (12) : 4051 - 4052
  • [9] Vibrational spectra of the YbB12 kondo insulator
    Rybina, A. V.
    Alekseev, P. A.
    Nemkovski, K. S.
    Nefeodova, E. V.
    Mignot, J.-M.
    Paderno, Yu. B.
    Shitsevalova, N. Yu.
    Bewley, R. I.
    CRYSTALLOGRAPHY REPORTS, 2007, 52 (05) : 770 - 773
  • [10] Asymmetric Anderson model and spin excitations in the Kondo insulator YbB12
    Barabanov, A. F.
    Maksimov, L. A.
    JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS, 2009, 109 (01) : 95 - 102
12345