Finite Temperature Magnetism in Gd: Evidence against a Stoner Behavior

K. Maiti; M. C. Malagoli; A. Dallmeyer; C. Carbone

doi:10.1103/PhysRevLett.88.167205

Finite Temperature Magnetism in Gd: Evidence against a Stoner Behavior

K. Maiti, M. C. Malagoli, A. Dallmeyer, and C. Carbone

Phys. Rev. Lett. 88, 167205 – Published 5 April 2002

Abstract

The temperature dependence of the rare-earth valence bands has been regarded as a realization of the Stoner behavior. The exchange splitting of the electronic states appears to scale as the magnetic order parameter for $T < T_{C}$ and to vanish at ${T = T}_{C}$ . We report here a spin-resolved photoemission study on the evolution of Gd bulk bands for $0.5 \leq {T / T}_{C} \leq 1$ . The spin-polarized spectral line shapes display a complex temperature dependence, which clearly contrasts with the interpretation of previous experimental results. The spin-resolved photoemission data demonstrate the inadequacy of the Stoner model to the description of magnetism in rare earths.

Received 19 September 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.167205

Authors & Affiliations

K. Maiti^*, M. C. Malagoli, A. Dallmeyer, and C. Carbone^†

Institut für Festkörperforschung, Forschungszentrum Jülich, D-52428 Jülich, Germany

^*Present address: Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India.
^†Present address: Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia, Sez. Trieste, Science Area Park, S.S. 163.5, Basovizza-Trieste, Italy.