Low-temperature properties of the random Heisenberg antiferromagnetic chain

✍ Scribed by Dasgupta, Chandan; Ma, Shang-keng

• Book ID: 120810746
• Publisher: The American Physical Society
• Year: 1980
• Tongue: English
• Weight: 641 KB
• Volume: 22
• Category: Article
• ISSN: 1098-0121
• DOI: 10.1103/PhysRevB.22.1305

✦ Synopsis

The one-dimensional quantum spin- & Heisenberg antiferromagnetic model with randomly distributed interaction strengths is solved approximately for several different distributions. Ground-state energy and low-temperature properties are evaluated. Universal qualitative features are found in the specific heat and the magnetic susceptibility, which display a power-law dependence on temperature. Such features hold for nonsingular distributions as well as for dis- tributions with power-law divergence at the origin. The approximate method of solution is based on successive eliminations of spins coupled by the maximum coupling constant.