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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2003

XY frustrated systems: Continuous exponents in discontinuous phase transitions

Résumé

XY frustrated magnets exhibit an unsual critical behavior: they display scaling laws accompanied by nonuniversal critical exponents and a negative anomalous dimension. This suggests that they undergo weak first order phase transitions. We show that all perturbative approaches that have been used to investigate XY frustrated magnets fail to reproduce these features. Using a nonperturbative approach based on the concept of effective average action, we are able to account for this nonuniversal scaling and to describe qualitatively and, to some extent, quantitatively the physics of these systems.

Dates et versions

hal-00002240 , version 1 (21-07-2004)

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Mathieu Tissier, Bertrand Delamotte, Dominique Mouhanna. XY frustrated systems: Continuous exponents in discontinuous phase transitions. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2003, 67, pp.134422. ⟨hal-00002240⟩
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