Spin and orbital hybridization at specifically nested Fermi surfaces in URu(2)Si(2)
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
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.
IdentifiersURN: urn:nbn:se:uu:diva-165616DOI: 10.1103/PhysRevB.84.241102ISI: 000297551900002OAI: oai:DiVA.org:uu-165616DiVA: diva2:476940