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Magnetooptical microwave spectroscopy of the coherent magnetic state in the mixed valence compound SmB6 in the frequency range 40–120 GHz

  • S. V. Demishev
  • A. V. Semeno
  • N. E. Sluchanko
  • N. A. Samarin
  • J. Singleton
  • A. Ardavan
  • S. J. Blundell
  • W. Hayes
  • S. Kunii
Condensed Matter

Abstract

In undoped pure single crystals of the mixed valence compound SmB6 anomalous ESR absorption is observed in the frequency range v=40–120 GHz at temperatures of 1.8–4.2 K. The ESR for the case of the coherent ground state consists of two components corresponding to g-factors g1=1.907±0.003 and g2=1.890±0.003. The amplitude of both ESR lines strongly depends on temperature in the temperature range studied: the amplitude of the first line with g=g1 increases and the amplitude of the second line decreases with temperature. A model based on consideration of intrinsic defects in the SmB6 crystalline lattice, with a densit ∼1015−1016 cm−3, is suggested as an explanation for the anomalous ESR-behavior. In the frequency range v>70 GHz at T=4.2 K, in addition to the main ESR lines, a new magnetic resonance with a hysteretic field dependence is discovered.

PACS numbers

75.30.−m 

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Copyright information

© MAIK "Nauka/Interperiodica" 1996

Authors and Affiliations

  • S. V. Demishev
    • 1
  • A. V. Semeno
    • 1
  • N. E. Sluchanko
    • 1
  • N. A. Samarin
    • 1
  • J. Singleton
    • 2
  • A. Ardavan
    • 2
  • S. J. Blundell
    • 2
  • W. Hayes
    • 2
  • S. Kunii
    • 3
  1. 1.General Physics Institute of the Russian Academy of SciencesMoscowRussia
  2. 2.The Clarendon LaboratoryUniversity of OxfordOxfordUnited Kingdom
  3. 3.Department of Physics, Faculty of ScienceTohoku UniversityAramaki, Aoba-Ku, Sendai 980Japan

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