Quantum Monte Carlo study of spin 12 ± Jz chains

✍ Scribed by Wataru Yokozeki; Kazuo Shiiki; Mitsuru Fukuchi

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 546 KB
• Volume: 223
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(95)00290-1

✦ Synopsis

Disorder of anisotropy is introduced into spin 1/2 quantum XXZ chains. This model, which is refered as the spin 1/2 + Jz chain, is studied by the quantum Monte Carlo method. It displays the critical phenomena of the x-y phase, though the critical exponents ),, r/ and v must be corrected. However, the antiferromagnetic alternating spin chains show no critical phenomena. It is found that the susceptibility along the z axis and averaged zz pair spin correlation functions of alternating spin chains show obviously different behavior from those of +Jz chains.