Frustration-Induced Valence-Bond Ordering in a New Quantum Triangular Antiferromagnet Based on [Pd(dmit)2]

• Tamura Masafumi

  Condensed Molecular Materials Lab., JST-CREST, RIKEN

• Nakao Akiko

  Condensed Molecular Materials Lab., JST-CREST, RIKEN

• Kato Reizo

  Condensed Molecular Materials Lab., JST-CREST, RIKEN

Bibliographic Information

Other Title

• Frustration-Induced Valence-Bond Ordering in a New Quantum Triangular Antiferromagnet Based on [Pd(dmit)₂]

Abstract

The temperature dependence of magnetic susceptibility, χ(T), of the P2₁⁄m crystal of a novel [Pd(dmit)₂] salt, (C₂H₅)(CH₃)₃P[Pd(dmit)₂]₂, has been measured. The observed χ(T) above 30 K is reproduced by the model of a spin-1/2 Heisenberg antiferromagnet on a triangular lattice with the exchange coupling, J⁄k_B=250 K. A phase transition at 25 K to a spin-gapped state has been found. As well as a spin-Peierls transition, this transition breaks the translational symmetry, leading to the formation of a columnar arrangement of the spin-singlet pairs. A significant role of the lattice structure in stabilizing the spin-singlet ordering is pointed out. To our knowledge, this is the first report of a two-dimensional (2D) spin system exhibiting a spin-Peierls-like transition.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 75 (9), 093701-, 2006

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• Pd(dmit)<SUB>2</SUB>
• magnetic susceptibility
• X-ray crystal structure
• spin-Peierls transition
• valence bond order

Details

• CRID: 1390282679167194112
• NII Article ID: 110004789060
• NII Article ID: 210000106305
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.75.093701
• BIBCODE: 2006JPSJ...75i3701T
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 8055151
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8055151
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.093701
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed