Novel order parameter for describing the critical behavior of Ising spin glass

F. ROMÁ; A. J. RAMIREZ-PASTOR; F. NIETO; E. E. VOGEL

PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS

Elsevier Science

Lugar: Amsterdam; Año: 2006 vol. 363 p. 327 - 333

0378-4371

A novel order parameter f for spin glasses is defined based on topological criteria and with a clear physical interpretation.  f is first investigated for well known magnetic systems and then applied to the Edwards–Anderson  ±J model on a square lattice, comparing its properties with the usual q order parameter. Finite size scaling procedures are performed. Results and analyses based on f confirm a zero temperature phase transition and allow to identify the low temperature phase. The advantages of f are brought out and its physical meaning is established.