Static chaos and scaling behaviour in the spin-glass phase

Details Static chaos and scaling behaviour in the spin-glass phase Static chaos and scaling behaviour in the spin-glass phase

1994-04-09

arxiv.org/abs/cond-mat/9404020v1

Physics

Condensed Matter

28 pages + 6 figures, LateX, figures uuencoded at the end of file

Scientific paper

10.1103/PhysRevB.50.6844

We discuss the problem of static chaos in spin glasses. In the case of magnetic field perturbations, we propose a scaling theory for the spin-glass phase. Using the mean-field approach we argue that some pure states are suppressed by the magnetic field and their free energy cost is determined by the finite-temperature fixed point exponents. In this framework, numerical results suggest that mean-field chaos exponents are probably exact in finite dimensions. If we use the droplet approach, numerical results suggest that the zero-temperature fixed point exponent $\theta$ is very close to $\frac{d-3}{2}$. In both approaches $d=3$ is the lower critical dimension in agreement with recent numerical simulations.

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