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物理学报. 2005, 54(1): 280-283.
doi: 10.7498/aps.54.280.
磁场诱导的单离子各向异性反铁磁链的比热
- 收稿日期: 2003-11-05
- 修回日期: 2004-05-08
- 刊出日期: 2005-01-19
摘要: 利用改进的Schwinger玻色子平均场理论,研究了横向外加磁场下自旋为1的单粒子各向异性海森堡反铁磁链的热力学性质.发现在外加磁场下预示这一体系中存在Luttinger液体相—完全极化相相变的比热奇性,并给出了相应的相图.研究还发现,单粒子各向异性对比热的影响较小,这和纵向场的结果完全不同.以上结果对整自旋的反铁磁链具有普适性,对实验研究具有指导性.
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关键词:
- 反铁磁链 /
- 热力学性质 /
- Schwinger 玻色子
English Abstract
Field-induced specific heat for the antiferromagnetic chain with single-ion anisotropy
- Received Date:
05 November 2003
- Accepted Date:
08 May 2004
- Published Online:
19 January 2005
Abstract: The thermodynamic properties in one-dimensional S=1 Heisenberg antiferromagnet with single-ion anisotropy in the presence of a transverse magnetic field is obtained on the basis of the Schwinger boson mean-field theory. The anomalies of the specific heat at low temperatures, which might be an indicative of a field-induced transition from a Luttinger liquid phase to an ordered phase, are explicitly uncovered under the transverse field. A schematic phase diagram is proposed. The little effect of the single-ion anisotropy on specific heat is also observed, the result is very different from that obtained under a longitudinal field. All results above are expected to be helpful for the experimental investigation.
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