Exotic ground state phases of S=1/2 heisenberg Delta-chain with ferromagnetic main chain

• 飛田, 和男

抄録

type:text

The ground state phase diagram of the spin-1/2 Heisenberg frustrated Delta-chain with a ferromagnetic main chain is investigated. In addition to the ferromagnetic phase, various nonmagnetic ground states are found. If the ferromagnetic coupling between apical spins and the main chain is strong, this model is approximated by a spin-1 bilinear-biquadratic chain and the spin quadrupolar phase with spin-2 gapless excitation is realized in addition to the Haldane and ferromagnetic phases. In the regime where the coupling between the apical spins and the main chain is weak, the numerical results which suggest the possibility of a series of phase transitions among different nonmagnetic phases are obtained. Physical pictures of these phases are discussed based on the numerical results.

identifier:http://jpsj.ipap.jp/link?JPSJ/77/044707/

identifier:arXiv:0709.1423v2

収録刊行物

• JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN

  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 (4), 044707-1-044707-7, 2008

  PHYSICAL SOCIETY OF JAPAN

キーワード

• Delta-chain
• Haldane phase
• spin-quadrupolar phase
• Uimin-Lai-Sutherland point
• ferromagnetism

詳細情報

• CRID: 1050001337818792832
• NII論文ID: 120006385797
• ISSN: 00319015
• Web Site: http://id.nii.ac.jp/1586/00013305/
• 本文言語コード: en
• 資料種別: journal article
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