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Journal of the Korean Physical Society

, Volume 62, Issue 12, pp 2197–2201 | Cite as

Antiferromagnetic phase transition of K-Rb alloy nanoclusters incorporated in sodalite

  • Takehito NakanoEmail author
  • Yuko Ishida
  • Atsufumi Hanazawa
  • Yasuo Nozue
Article

Abstract

We prepared Rb-rich K-Rb alloy nanoclusters arrayed in the regular nanospace of aluminosilicate sodalite which has a bcc arrangement of cages. The average chemical formula of the cluster is (K1.5Rb2.5)3+, where one unpaired s-electron is shared by four alkali cations and is confined in a cage. The magnetic susceptibility and the electron spin resonance clearly show an antiferromagnetic phase transition at a Néel temperature T N of approximately 90–100 K. The observed T N is higher than that in K 4 3+ (T N = 72 K) and (K3Rb)3+ clusters (T N = 80 K) in sodalites. This result indicates a systematic enhancement of the antiferromagnetic exchange coupling between the adjacent nanoclusters by substituting Rb atoms for K ones. The size and the spatial distribution of the s-electron wave function in the nanocluster play a key role in the exchange coupling.

Keywords

Antiferromagnetism Alkali-metal cluster Zeolite Sodalite 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Takehito Nakano
    • 1
    Email author
  • Yuko Ishida
    • 1
  • Atsufumi Hanazawa
    • 1
  • Yasuo Nozue
    • 1
  1. 1.Department of Physics, Graduate School of ScienceOsaka UniversityToyonaka, OsakaJapan

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