We investigate the influence of spatial correlations between the values of the random field on the critical behavior of random-field lattice models and derive a generalized version of the Schwartz-Soffer inequality for the averages of the susceptibility and its disconnected part. At the critical point this leads to a modification of the Schwartz-Soffer exponent inequality for the critical exponents η and η- describing the divergences of the susceptibility and its disconnected part, respectively. It now reads η- ≤ 2η-2y where 2y describes the divergence of the random-field correlation function in Fourier space. As an example we exactly calculate the susceptibility and its disconnected part for the random-field spherical model. We find that in this case the inequalities actually occur as equalities.
T. Vojta and M. Schreiber, "Generalization of the Schwartz-Soffer Inequality for Correlated Random Fields," Physical Review B, vol. 52, no. 2, pp. R693-R695, American Physical Society (APS), Jul 1995.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevB.52.R693
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