Critical exponents of the gauge glass

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Abstract
The spin-glass phase suggested for granular superconductors in an externally applied magnetic field is discussed in detail. The spin-glass order parameter is an n×n, n≡0 Hermitian matrix. As a consequence, we show, by explicit calculation of the critical exponents to order ε=6-d, that the ‘‘gauge’’ glass is not in the same universality class as any of the vector spin-glass models.