High-pressure form of (VO)2P2O7: A spin -½ antiferromagnetic alternating-chain compound with one kind of chain and a single spin gap

M. Azuma, T. Saito, Y. Fujishiro, Z. Hiroi, M. Takano, F. Izumi, T. Kamiyama, T. Ikeda, Y. Narumi, K. Kindo

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42 Citations (Scopus)

Abstract

(VO)2P2O7, known as a quantum spin chain compound, was found to undergo a structural transition when treated at 2 GPa and 700 ° C. The high-pressure phase as studied by powder x-ray and neutron diffractions comprises a unique kind of spin-1/2 Heisenberg alternating antiferromagnetic chain, in contrast with the ambient pressure phase containing two crystallographically different chains. Magnetic susceptibility, high-field magnetization, and specific-heat data showed the presence of a single spin gap of 23 (magnetization)–27 (susceptibility) K, not double as observed for the ambient pressure phase. This result is consistent with recent magnetization and NMR studies which indicated that the two kinds of chains of the ambient pressure phase have single, different spin gaps.

Original languageEnglish
Pages (from-to)10145-10149
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number14
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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