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Hidden order in URu2Si2 originates from Fermi surface gapping induced by dynamic symmetry breaking
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
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2009 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 8, no 4, 337-341 p.Article in journal (Refereed) Published
Abstract [en]

Spontaneous, collective ordering of electronic degrees of freedom leads to second-order phase transitions that are characterized by an order parameter driving the transition. The notion of a 'hidden order' has recently been used for a variety of materials where a clear phase transition occurs without a known order parameter. The prototype example is the heavy-fermion compound URu2Si2, where a mysterious hidden-order transition occurs at 17.5 K. For more than twenty years this system has been studied theoretically and experimentally without a firm grasp of the underlying physics. Here, we provide a microscopic explanation of the hidden order using density-functional theory calculations. We identify the Fermi surface 'hot spots' where degeneracy induces a Fermi surface instability and quantify how symmetry breaking lifts the degeneracy, causing a surprisingly large Fermi surface gapping. As the mechanism for the hidden order, we deduce spontaneous symmetry breaking through a dynamic mode of antiferromagnetic moment excitations.

Place, publisher, year, edition, pages
2009. Vol. 8, no 4, 337-341 p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-129853DOI: 10.1038/NMAT2395ISI: 000264501000027OAI: oai:DiVA.org:uu-129853DiVA: diva2:345513
Available from: 2010-08-25 Created: 2010-08-25 Last updated: 2017-12-12Bibliographically approved

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Rusz, JanAmft, MartinOppeneer, Peter M.

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