Evolution of Spin Gap in the Excitation Spectra of Quasi-Two-Dimensional S -1/2 System CaV4O9

Katsuaki Kodama, Hiroshi Harashina, Shin Ichi Shamoto, Satoshi Taniguchi, Masatoshi Sato, Kazuhisa Kakurai, Masakazu Nishi

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17 Citations (Scopus)

Abstract

Neutron inelastic scattering studies have been performed on the quasi-two-dimensional spingap system CaV4O9. An energy gap of about 10meV has been clearly observed in the magnetic excitation spectra at low temperatures. The Q-point of the minimum excitation energy may not correspond to the so-called (π, π), (π, 0) or Γ-points in the reciprocal cell of the two-dimensional tetragonal lattice. With decreasing temperature, the scattering intensity in the energy region around 12meV begins to increase at about 100K. which almost coincides with the temperature at which the susceptibility has a maximum value. This result may provide important information to understand the "spin-gap anomaly" of high-Tc oxides.

Original languageEnglish
Pages (from-to)1941-1944
Number of pages4
JournalJournal of the Physical Society of Japan
Volume65
Issue number7
DOIs
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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