Sequential spin polarization of the Fermi surface pockets in URu2Si2 and its implications for the hidden order

M M Altarawneh; N Harrison; S E Sebastian; L Balicas; P H Tobash; J D Thompson; F Ronning; E D Bauer

doi:10.1103/PhysRevLett.106.146403

Sequential spin polarization of the Fermi surface pockets in URu2Si2 and its implications for the hidden order

Phys Rev Lett. 2011 Apr 8;106(14):146403. doi: 10.1103/PhysRevLett.106.146403. Epub 2011 Apr 7.

Authors

M M Altarawneh¹, N Harrison, S E Sebastian, L Balicas, P H Tobash, J D Thompson, F Ronning, E D Bauer

Affiliation

¹ Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA.

PMID: 21561207
DOI: 10.1103/PhysRevLett.106.146403

Abstract

Using Shubnikov-de Haas oscillations measured in URu2Si2 over a broad range in a magnetic field of 11-45 T, we find a cascade of field-induced Fermi surface changes within the hidden order phase I and further signatures of oscillations within field-induced phases III and V [previously discovered by Kim et al., [Phys. Rev. Lett. 91, 256401 (2003)]. A comparison of kinetic and Zeeman energies indicates a pocket-by-pocket polarization of the Fermi surface leading up to the destruction of the hidden order phase I at ≈35 T. The anisotropy of the Zeeman energy driving the transitions in URu2Si2 points to an itinerant hidden order parameter involving quasiparticles whose spin degrees of freedom depart significantly from those of free electrons.