Phase diagram for two-dimensional spin systems with ladder, plaquette and mixed-spin structures

被引：5

作者：

Koga, A ^{[1
]}

Kawakami, N ^{[1
]}

机构：

[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2000年 / 69卷 / 06期

关键词：

Heisenberg antiferromagnet; cluster expansion; two dimension; quantum phase transition; spin gap;

D O I：

10.1143/JPSJ.69.1834

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By using the cluster expansion techniques, we study the excitation spectrum fur the two-dimensional quantum spin systems with ladder, plaquette and mixed-spin structures. We thus determine the phase boundary between the spin-gap phase and the magnetically ordered phase rather precisely. The phase diagram obtained is consistent with the one previously obtained via the staggered susceptibility, and is further improved for several cases.

引用

页码：1834 / 1836

页数：3

共 11 条

[1] High-order convergent expansions for quantum many particle systems [J].

Gelfand, MP ;

Singh, RRP .

ADVANCES IN PHYSICS, 2000, 49 (01) :93-140

[2] Series expansions for excited states of quantum lattice models [J].

Gelfand, MP .

SOLID STATE COMMUNICATIONS, 1996, 98 (01) :11-14

[3]

Guttmann AJ, 1989, PHASE TRANSITIONS CR, V13

[4] Scaling properties of antiferromagnetic transition in coupled spin ladder systems doped with nonmagnetic impurities [J].

Imada, M ;

Iino, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1997, 66 (03) :568-571

[5] Exact dimer ground state and quantized magnetization plateaus in the two-dimemsional spin system SrCu2(BO3)2 [J].

Kageyama, H ;

Yoshimura, K ;

Stern, R ;

Mushnikov, N ;

Onizuka, K ;

Kato, M ;

Kosuge, K ;

Slichter, CP ;

Goto, T ;

Ueda, Y .

PHYSICAL REVIEW LETTERS, 1999, 82 (15) :3168-3171

[6] PHASE-DIAGRAM OF S=1/2 QUASI-ONE-DIMENSIONAL HEISENBERG-MODEL WITH DIMERIZED ANTIFERROMAGNETIC EXCHANGE [J].

KATOH, N ;

IMADA, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1994, 63 (12) :4529-4541

[7] Quantum phase transitions in two-dimensional spin systems with ladder, plaquette and mixed-spin structures [J].

Koga, A ;

Kumada, S ;

Kawakami, N .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (07) :2373-2379

[8]

NONOMURA Y, UNPUB

[9] GROUND-STATES OF LOW-DIMENSIONAL QUANTUM ANTIFERROMAGNETS [J].

SINGH, RRP ;

GELFAND, MP ;

HUSE, DA .

PHYSICAL REVIEW LETTERS, 1988, 61 (21) :2484-2487

[10] SPIN GAP BEHAVIOR OF S=1/2 QUASI-2-DIMENSIONAL SYSTEM CAV4O9 [J].

TANIGUCHI, S ;

NISHIKAWA, T ;

YASUI, Y ;

KOBAYASHI, Y ;

SATO, M ;

NISHIOKA, T ;

KONTANI, M ;

SANO, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1995, 64 (08) :2758-2761

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