Surfaces of the perovskite manganites La_1-xCa_xMnO₃

Authors

Jaewu Choi, University of Nebraska-LincolnFollow
Jiandi Zhang, Florida International UniversityFollow
Sy-Hwang Liou, University of Nebraska-LincolnFollow
Peter A. Dowben, University of Nebraska-LincolnFollow
E. Ward Plummer, University of Tennessee, KnoxvilleFollow

Date of this Version

5-15-1999

Comments

Published in Physical Review B: Condensed Matter and Materials Physics 59, 13453-13459 (1999). Copyright 1999 The American Physical Society. Used by permission.
URL: http://link.aps.org/abstract/PRB/v59/p13453
DOI: 10.1103/PhysRevB.59.13453

Abstract

Angle-resolved core-level photoemission has been utilized to study the surfaces of crystalline thin films of manganite La_1-xCa_xMnO₃ (x=0.1 and 0.35). It is found that both the surface termination and Ca surface concentration depend on the bulk Ca concentration. For La_0.65Ca_0.35MnO₃, the terminal layer is predominately Mn-O, while for La_0.9Ca_0.1MnO₃, the majority of the surface is La/Ca-O terminated. Both surfaces exhibit a large enhancement in the Ca concentration compared to the bulk with the La_0.9Ca_0.1MnO₃ sample, having a larger surface Ca concentration than for the La_0.65Ca_0.35MnO₃ material.