Effective surface Debye temperature for NiMnSb.100. epitaxial films

Authors

• C.N. Borca, University of Nebraska-Lincoln
• Takashi Komesu, University of Nebraska-LincolnFollow
• Hae-kyung Jeong, University of Nebraska-LincolnFollow
• Peter A. Dowben, University of Nebraska-LincolnFollow
• D. Ristoiu, Laboratoire L. Ne´el, CNRS, BP 166 X, 38042 Grenoble Cedex 9, France
• Ch. Hordequin, Laboratoire L. Ne´el, CNRS, BP 166 X, 38042 Grenoble Cedex 9, France
• J. Pierre, Laboratoire L. Ne´el, CNRS, BP 166 X, 38042 Grenoble Cedex 9, France
• J. P. Nozie`res, Laboratoire L. Ne´el, CNRS, BP 166 X, 38042 Grenoble Cedex 9, France

Document Type

Article

Date of this Version

July 2000

Comments

Published Applied Physics Letters 77 (2000) 88-90. Permission to use.

Abstract

The surface Debye temperature of the NiMnSb (100) epitaxial films has been obtained using low energy electron diffraction, inverse photoemission, and core-level photoemission. The normal dynamic motion of the (100) surface results in a value for the effective surface Debye temperature of 145613 K. This is far smaller than the bulk Debye temperature of 31265 K obtained from wave vector dependent inelastic neutron scattering. The large difference between these measures of surface and bulk dynamic motion indicates a soft and compositionally different (100) surface. © 2000 American Institute of Physics. [S0003-6951(00)05127-5]