High field magnetism of the spinel oxide CoAl 2O 4

M. Hagiwara, S. Kimura, N. Nishihagi, T. Suzuki, M. Nohara, H. Takagi, K. Kindo

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10 Citations (Scopus)


We report the results of magnetization and electron spin resonance (ESR) measurements on sintered samples of the spinel oxide CoAl 2O 4 in magnetic fields up to 53 T. In CoAl 2O 4, Co 2+ (S=3/2) ions make a diamond lattice, indicating naively that no geometrical frustration takes place. This spinel oxide, however, is thought to be in the vicinity of a quantum melting point of the antiferromagnetically ordered state because of no sharp peak in the temperature dependence of specific heat. Magnetization curve at 4.2 K is almost linear in magnetic fields and a broad ESR signal was observed on a straight resonance line with g=2.26, implying an antiferromagnetic long range order or a well developed antiferromagnetic short range order with very small anisotropy.

Original languageEnglish
Pages (from-to)11-14
Number of pages4
JournalJournal of Low Temperature Physics
Issue number1-2
Publication statusPublished - 2010 Apr


  • ESR
  • Geometrical frustration
  • High field magnetism
  • Magnetization
  • Spinel oxides


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