Temperature-dependent electronic structure in a localized-magnetic-moment system: Gadolinium

Authors

Dongqi Li, Syracuse University
Jiandi Zhang, Syracuse UniversityFollow
Peter A. Dowben, Syracuse University and University of Nebraska-LincolnFollow
M. Onellion, University of Wisconsin-Madison

Date of this Version

4-1-1992

Comments

Published by American Physical Society. Copyright 1992. Permission to use. Physical Review B 45 (1992) 7272–7281. http://prb.aps.org/.

Abstract

At normal emission, the bulklike band in gadolinium overlayers on W(110) shifts toward EF from 1.64 eV at 310 K to 1.43 eV at 230 K in photoemission. This is accompanied by an increase of the feature width from 0.8 eV at 320 K to 1.1 eV at 230 K. The surface-state binding energy remains unchanged, though the width increases significantly with increasing temperature. The different effects of temperature upon the photoemission results obtained for the bulklike and surface states are interpreted as magnetic-order-induced band movement and spin mixing, respectively, and are discussed in the light of a quasiparticle theory. The band dispersion along Σ¯ is also temperature dependent. We postulate that the exchange splitting of the conduction band is not uniform at different positions in k space.