The kinetic energy dependent effective Debye temperature for CoS₂ (100)

Authors

Ning Wu, University of Nebraska-Lincoln
David Wisbey, University of Nebraska-Lincoln
Takashi Komesu, University of Nebraska-LincolnFollow
Z. X. Yu, Zhongshan University
M. Manno, University of Minnesota, Minneapolis, MN
L. Wang, University of Minnesota, Minneapolis, MN
C. Leighton, University of Minnesota, Minneapolis, MN
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

1-1-2008

Comments

Published in Physics Letters A (2008). Copyright © 2007 Published by Elsevier B.V. Used by permission. http://www.sciencedirect.com/science/journal/03759601/

Abstract

The effective Debye temperatures of the highly spin-polarized material CoS₂ were measured using temperature dependent low energy electron diffraction and shown to be dependent upon electron kinetic energy. The normal dynamic motion of the (100) surface results in the effective surface Debye temperature of 326 ± 9 K compared to a bulk Debye temperature of 612 ± 24 K. Similar values for the bulk Debye temperature have been obtained through LEED I(V) analysis, core level photoemission with a lower value for the bulk Debye temperature found from heat capacity measurements.