Abstract
The infinite-range quantum Ising spin glass in a transverse and a Gaussian random field has been studied by combining the pair approximation with the discretized path-integral representation. The phase diagrams are obtained, and the possibilities of the existence of a mixed phase in which ferromagnetism and spin-glass order coexist are discussed. This is expected to interpret some properties of the mixed hydrogen-bonded ferroelectric and antiferroelectric crystals such as Rb1-x(NH)4xH2PO.
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