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Physics Letters A

Critical behaviour of quantum systems with quenched point impurities

Elka Korutcheva, Dimo I. Uzunov

Published Dec 1, 1984• 15 citations
Publisher
DOI
10.1016/0375-9601(84)90312-8

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By means of the renormalisation-group approach, static and dynamic critical behaviours are studied for the XY spin system with cubic anisotropy and with quenched random nonmagnetic impurities. The stability of the quenched-random-impurity fixed point in d ( identical to 4- epsilon ) dimensions, the flow diagram of the interactions and the critical exponents are investigated, within the two-loop approximation, in terms of the epsilon 1/2 expansion. It is shown that the transition that appears is a first-order transition.