Antiferromagnetic Resonance in Sodium Clusters in Sodalite

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  • Nakano Takehito
    Department of Physics, Graduate School of Science, Osaka University
  • Kashiwagi Takanari
    KYOKUGEN (Center for Quantum Science and Technology under Extreme Conditions), Osaka University
  • Hanazawa Atsufumi
    Department of Physics, Graduate School of Science, Osaka University
  • Watanabe Kunihiro
    Department of Physics, Graduate School of Science, Osaka University
  • Hagiwara Masayuki
    KYOKUGEN (Center for Quantum Science and Technology under Extreme Conditions), Osaka University
  • Nozue Yasuo
    Department of Physics, Graduate School of Science, Osaka University

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Abstract

Sodium clusters arrayed in aluminosilicate sodalite are known to show antiferromagnetism below the Néel temperature TN of 48 K. We have performed electron spin resonance (ESR) measurements on a powder specimen of this material at an X-band microwave frequency (9.7 GHz) with temperature varying between 4 and 300 K. The ESR spectra show asymmetric broadening below TN, which can be regarded as a powder pattern of the antiferromagnetic resonance (AFMR) signal. From the analysis of the AFMR fields at low temperatures using the exchange-coupling constants evaluated from the magnetic susceptibility, the anisotropy field is estimated to be significantly small at about 1–2 Oe. These results indicate that this material is an ideal Heisenberg antiferromagnet resulting from the character of s-electrons in zeolite cages with a cubic arrangement.

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