Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-13
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 7 figures
Scientific paper
10.1143/JPSJ.75.094708
A possible spin-reorientation transition in field-induced magnetic ordering phases of the S=1 Haldane system with large easy-plane anisotropy is proposed, using an effective Lagrangian formalism as well as the density matrix renormalization group method. Such a spin-reorientation transition is predicted in the case where the applied magnetic field is inclined from the easy axis of the anisotropy. We point out that this transition has a close connection with a variation of the order parameter even at zero temperature, although it is different from a quantum analog of the so-called spin-flop transition proposed for the system having a strong easy axis anisotropy. In connection with a novel phase observed recently in the Haldane system at high fields, we discuss possible implications for the field-induced magnetic ordering.
Harada Isao
Hiwasa Tomohiko
Miyazaki Hiroshi
Oko Masataka
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