Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-20
Europhysics Letters 97, 20007 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 eps figures, final version as published
Scientific paper
10.1209/0295-5075/97/20007
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$_3$.
Hrahsheh Fawaz
Nozadze David
Svoboda Christopher
Vojta Thomas
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