Submillimeter wave ESR study of magnetic excitations in the ising ferromagnetic chain CoNb2O6

Takashi Kunimoto, Keigo Nagasaka, Hiroyuki Noriji, Sebastian Luther, Mitsuhiro Motokawa, Hitoshi Ohta, Tomohiro Goto, Susu Mu Okubo, Kay Kohn

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10 Citations (Scopus)


Magnetic excitations in the Ising ferromagnetic chain CoNb2O6 have been studied by submillimeter wave electron spin resonance in strong transverse magnetic fields. A distinct non-linear field dependence of the resonance branches and also zero field splittings have been observed. A large residual intensity of the spin-cluster resonance was found which was caused by the strong mixing among the different n-fold spin-clusters. In addition to a series of n-fold spin-cluster excitations, we also discovered a new set of spin-cluster excitation which can be attributed to non-integer n such as n ∼ 1.5 or n ∼ 2.5 for the first time. This effect is explained by the change of the quantization axis of the system in strong transverse magnetic fields. These new aspects of spin-cluster excitation show the significant effect of transverse magnetic fields on the magnetic excitation in an Ising ferromagnetic chain.

Original languageEnglish
Pages (from-to)1703-1710
Number of pages8
JournalJournal of the Physical Society of Japan
Issue number5
Publication statusPublished - 1999 May


  • CoNbO
  • Spin-cluster excitation
  • Submillimeter wave ESR
  • Transverse magnetic field


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