Disorder correlations at smeared phase transitions

Abstract

We investigate the influence of spatial disorder correlations on smeared phase transitions, taking the quantum phase transition in itinerant magnets as an example. We find that even short-range correlations can have a dramatic effect and qualitatively change the behavior of observable quantities. This is in marked contrast to conventional critical phenomena, at which short-range disorder correlations are irrelevant. We develop an optimal fluctuation theory of the quantum phase transition in the presence of correlated disorder, and we illustrate the results by computer simulations. As an experimental application, we discuss the ferromagnetic quantum phase transition in Sr${}_{1-x}$Ca${}_x$RuO${}_3$.

6 pages, 4 eps figures, final version as published

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Cited by in corpus (6)

• Metallic Quantum Ferromagnets
• Disorder in quantum many-body systems
• Dissipation effects in random transverse-field Ising chains
• A smeared quantum phase transition in disordered holography
• Enhanced rare region effects in the contact process with long-range correlated disorder
• Strong-disorder magnetic quantum phase transitions: Status and new developments