Reentrant phases in the ± J spin glass

✍ Scribed by Shirin Haque-Copilah; Aldwyn Tang Kai; Naeem Jan

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 463 KB
• Volume: 231
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(96)00115-x

✦ Synopsis

We consider an enlarged phase space of the +J spin glass which includes the dilute Ising model and the frustrated system. The three orthogonal axes in this space are: (i) The fraction of ferro-to antiferro-magnetic bonds, p; (ii) the ratio of the strengths of the antiferro-to ferromagnetic interations, q; and (iii) the temperature, T. Within this phase space we observe extended regions of the low-temperature spin-glass phase which is characterised by a unique distribution of the local-order parameter. We observe reentrant phase transitions: for fixed p and q with varying T the distribution of the local order parameter shows paramagnetic, ferromagnetic and then spin-glass phases; for fixed p and T and varying q the distribution shows ferromagnetic to paramagnetic and then spin-glass phases.