Journal
PHYSICAL REVIEW B
Volume 74, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.74.214419
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We study by the perturbative functional renormalization group (FRG) the random field and random anisotropy O(N) models near d=4, the lower critical dimension of ferromagnetism. The long-distance physics is controlled by zero-temperature fixed points at which the renormalized effective action is nonanalytic. We obtain the beta functions at two-loop order, showing that despite the nonanalytic character of the renormalized effective action, the theory is perturbatively renormalizable at this order. The physical results obtained at the two-loop level, most notably concerning the breakdown of dimensional reduction at the critical point and the stability of quasi-long-range order in d < 4, are shown to fit into the picture predicted by our recent nonperturbative FRG approach.
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