Direct Observation of the Spin Gap in NaV2O5 by Submillimeter Wave ESR

Sebastian Luther, Hiroyuki Nojiri, Mitsuhiro Motokawa, Masahiko Isobe, Yutaka Ueda, Sebastian Luther, Hiroyuki Nojiri

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33 Citations (Scopus)


Transitions between the singlet ground state and the first excited triplet state in NaV2O5 have been observed by means of submillimeter wave ESR for the first time. The distinct Zeeman splitting clearly indicates that the first excited state is a triplet state. The singlet-triplet energy gap at zero field has been determined as Δ = 8.13 meV at T = 4.2 K A considerable anisotropy of the absorption intensity with respect to the magnetic field orientation has been observed. The intensity is strongest for B//a and weakest for B//c. We propose that this result can be explained by including in the Hamiltonian the Dzyaloshinsky-Moriya interaction which breaks the selection rule.

Original languageEnglish
Pages (from-to)3715-3717
Number of pages3
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 1998


  • ESR
  • high magnetic fields
  • NaVO
  • spin gap
  • spin-Peierls system


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