Criticality in inhomogeneous magnetic systems: Application to quantum ferromagnets - Condensed Matter > Statistical MechanicsReportar como inadecuado




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Abstract: We consider a $\phi^4$-theory with a position-dependent distance from thecritical point. One realization of this model is a classical ferromagnetsubject to non-uniform mechanical stress. We find a sharp phase transitionwhere the envelope of the local magnetization vanishes uniformly. Thefirst-order transition in a quantum ferromagnet also remains sharp. Theuniversal mechanism leading to a tricritical point in an itinerant quantumferromagnet is suppressed, and in principle one can recover a quantum criticalpoint with mean-field exponents. Observable consequences of these results arediscussed.



Autor: D. Belitz, T. R. Kirkpatrick, Ronojoy Saha

Fuente: https://arxiv.org/







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