Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-07-17
Phys. Rev. B67, 014413 (2003)
Physics
Condensed Matter
Statistical Mechanics
10 pages, 6 figures; new references and small changes to text
Scientific paper
10.1103/PhysRevB.67.014413
The random field Ising model in three dimensions with Gaussian random fields is studied at zero temperature for system sizes up to 60^3. For each realization of the normalized random fields, the strength of the random field, Delta and a uniform external, H is adjusted to find the finite-size critical point. The finite-size critical point is identified as the point in the H-Delta plane where three degenerate ground states have the largest discontinuities in the magnetization. The discontinuities in the magnetization and bond energy between these ground states are used to calculate the magnetization and specific heat critical exponents and both exponents are found to be near zero.
Dukovski Ilija
Machta Jon
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