Ground state structure of diluted antiferromagnets and random field systems

Details Ground state structure of diluted antiferromagnets and random field systems Ground state structure of diluted antiferromagnets and random field systems

1997-04-04

arxiv.org/abs/cond-mat/9704041v1

Physica A 248, 1 (1998)

Physics

Condensed Matter

Disordered Systems and Neural Networks

11 pages, 13 figures, LaTex, submitted to Physica A

Scientific paper

A method is presented for the calculation of all exact ground states of diluted antiferromagnets and random field systems in an arbitrary range of fields. It works by calculating all jump-fields B,\Delta where the system changes it's ground state. For each field value all degenerated ground states are represented by a set of (anti-) ferromagnetic clusters and a relation between the clusters. So a complete description of the ground state structure of these systems is possible. Systems are investigated up to size 48^3 on the whole field-range and up to 160^3 for some particular fields. The behavior of order parameters is investigated, the number of jumps is analyzed and the degree of degeneracy as functions of size and fields is calculated.

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