Phase diagram of an anisotropic frustrated ferromagnetic spin-1/2 chain in a magnetic field: A density matrix renormalization group study

被引：71

作者：

Heidrich-Meisner, F. ^{[1
,2
,3
]}

McCulloch, I. P. ^{[4
]}

Kolezhuk, A. K. ^{[1
,2
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Theoret Phys C, D-52056 Aachen, Germany

[2] Res Ctr Julich, JARA Fundamentals Future Informat Technol, D-52425 Julich, Germany

[3] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

[4] Univ Queensland, Sch Phys Sci, Brisbane, Qld 4072, Australia

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 14期

基金：

美国国家科学基金会;

关键词：

QUANTUM; CUSP;

D O I：

10.1103/PhysRevB.80.144417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the phase diagram of a frustrated spin-1/2 ferromagnetic chain with anisotropic exchange interactions in an external magnetic field using the density matrix renormalization group method. We show that an easy-axis anisotropy enhances the tendency toward multimagnon bound states while an easy-plane anisotropy favors chirally ordered phases. In particular, a moderate easy-plane anisotropy gives rise to a quantum phase transition at intermediate magnetization. We argue that this transition is related to the finite-field phase transition experimentally observed in the spin-1/2 compound LiCuVO4.

引用

页数：9

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