Kiyomi Okamoto and Atsuhiro Kitazawa 1999 J. Phys. A: Math. Gen. 32 4601 doi:10.1088/0305-4470/32/25/304
Magnetization plateau and quantum phase transition of the S = ½ trimerized XXZ spin chain
Kiyomi Okamoto
and Atsuhiro Kitazawa
We study the plateau of the magnetization curve at M = Ms/3 (Ms is the saturation magnetization) of the S = ½ trimerized XXZ spin chain. By examining the level crossing of low-lying excitations obtained from the numerical diagonalization, we precisely determine the phase boundary between the plateau state and the no-plateau state on the 
-t plane, where denotes the XXZ anisotropy and t the magnitude of the trimerization. This quantum phase transition is of the Berezinskii-Kosterlitz-Thouless type.
- PACS
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
- MSC
- Subjects
- Dates
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Issue 25 (25 June 1999)
Received 9 September 1998, in final form 25 March 1999
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Magnetization plateau and quantum phase transition of the S = ½ trimerized XXZ spin chain
Kiyomi Okamoto and Atsuhiro Kitazawa 1999 J. Phys. A: Math. Gen. 32 4601
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