Positron annihilation study of the electronic structure of ${\text{URu}}_{2}{\text{Si}}_{2}$: Fermi surface and hidden order parameter

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Positron annihilation study of the electronic structure of ${URu}_{2} {Si}_{2}$ : Fermi surface and hidden order parameter

M. Biasini, J. Rusz, and A. P. Mills, Jr.

Phys. Rev. B 79, 085115 – Published 19 February 2009

Abstract

The Fermi surface (FS) of ${URu}_{2} {Si}_{2}$ 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 $5 f$ 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.

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Received 22 September 2008

DOI:https://doi.org/10.1103/PhysRevB.79.085115

Authors & Affiliations

M. Biasini^*

Department of Physics and Astronomy, University of California-Riverside, Riverside, California 92521, USA and ENEA, Via Martiri di Montesole, 40129 Bologna, Italy

J. Rusz^†

Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden and Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-182 21 Prague, Czech Republic

A. P. Mills, Jr.

Department of Physics and Astronomy, University of California-Riverside, Riverside, California 92521, USA

^*Deceased.
^†jan.rusz@fysik.uu.se

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Vol. 79, Iss. 8 — 15 February 2009

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Physical Review B

covering condensed matter and materials physics

Positron annihilation study of the electronic structure of ${URu}_{2} {Si}_{2}$ : Fermi surface and hidden order parameter

M. Biasini, J. Rusz, and A. P. Mills, Jr.

Phys. Rev. B 79, 085115 – Published 19 February 2009

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review B

covering condensed matter and materials physics

Positron annihilation study of the electronic structure of URu2Si2: Fermi surface and hidden order parameter

M. Biasini, J. Rusz, and A. P. Mills, Jr.

Phys. Rev. B 79, 085115 – Published 19 February 2009

Abstract

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Positron annihilation study of the electronic structure of ${URu}_{2} {Si}_{2}$ : Fermi surface and hidden order parameter