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Spin and orbital hybridization at specifically nested Fermi surfaces in URu(2)Si(2)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 24, 241102- p.Article in journal (Refereed) Published
Abstract [en]

The Fermi-surface (FS) nesting properties of URu(2)Si(2) are analyzed with particular focus on their implication for the mysterious hidden order phase. We show that there exist two Fermi surfaces that exhibit a strong nesting at the antiferromagnetic wave vector Q(0) = (0,0,1). The corresponding energy dispersions fulfill the relation epsilon(1)(k) = -epsilon(2)(k +/- Q(0)) at eight FS hot-spot lines. The spin-orbital characters of the involved 5f states are distinct (j(z) = +/-5/2 vs +/-3/2) and hence the degenerate Dirac crossings are symmetry protected in the nonmagnetic normal state. Dynamical symmetry breaking through an Ising-like spin and orbital excitation mode with Delta j(z) = +/-1 induces a hybridization of the two states, causing substantial FS gapping. Concomitant spin and orbital currents in the uranium planes give rise to a rotational symmetry breaking.

Place, publisher, year, edition, pages
2011. Vol. 84, no 24, 241102- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-165616DOI: 10.1103/PhysRevB.84.241102ISI: 000297551900002OAI: oai:DiVA.org:uu-165616DiVA: diva2:476940
Available from: 2012-01-12 Created: 2012-01-09 Last updated: 2017-12-08Bibliographically approved

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Oppeneer, Peter M.Rusz, JanFeng, Qingguo

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