This article reviews the unconventional effects of random disorder on magnetic quantum phase transitions, focusing on a number of new experimental and theoretical developments during the last three years. On the theory side, we address smeared quantum phase transitions tuned by changing the chemical composition, for example in alloys of the type A1-xBx. We also discuss how the interplay of order parameter conservation and overdamped dynamics leads to enhanced quantum Griffiths singularities in disordered metallic ferromagnets. Finally, we discuss a semiclassical theory of transport properties in quantum Griffiths phases. Experimental examples include the ruthenates Sr1-xCaxRuO3 and (Sr1-xCax)3Ru2O7 as well as Ba(Fe1-xMnx)2As2.
T. Vojta, "Strong-Disorder Magnetic Quantum Phase Transitions: Status and New Developments," Journal of Physics: Conference Series, vol. 529, no. 1, Institute of Physics - IOP Publishing, Sep 2014.
The definitive version is available at https://doi.org/10.1088/1742-6596/529/1/012016
17th International Conference on Recent Progress in Many-Body Theories (2013: Sep. 8-13, Rostock, Germany)
Center for High Performance Computing Research
Keywords and Phrases
Physics; Chemical Compositions; Magnetic Quantum Phase Transition; Metallic Ferromagnets; Quantum Griffiths Singularity; Quantum Phase Transitions; Random Disorders; Semiclassical Theories; Theoretical Development; Phase Transitions
International Standard Serial Number (ISSN)
Article - Conference proceedings
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01 Sep 2014