Positron annihilation study of the electronic structure of URu.sub.2./sub.Si.sub.2./sub.: Fermi surface and hidden order parameter

0340460 - FZÚ 2010 RIV US eng J - Journal Article
Biasini, M. - Rusz, Ján - Mills, A.
Positron annihilation study of the electronic structure of URu₂Si₂: Fermi surface and hidden order parameter.
Physical Review. B. Roč. 79, č. 8 (2009), 085115/1-085115/10. ISSN 1098-0121
Institutional research plan: CEZ:AV0Z10100520
Keywords : positron annihilation * 2D-ACAR * URu₂Si₂ * density functional theory * hidden order * Fermi surface
Subject RIV: BE - Theoretical Physics
Impact factor: 3.475, year: 2009
http://prb.aps.org/abstract/PRB/v79/i8/e085115

he Fermi surface (FS) of URu2Si2 in the paramagnetic phase has been reinvestigated via the measurement of the two-dimensional angular correlation of the positron annihilation radiation. Unlike previous measurements our experiment provides evidence that density-functional theory gives a fair qualitative description of the FS, showing a large contribution from the 5f electrons, although the Fermi volume of electron and hole pockets determined experimentally is smaller than the theoretical description. Furthermore, we propose a method to investigate the nature of the hidden order responsible for the 17.5 K transition.
Permanent Link: http://hdl.handle.net/11104/0183684