Surface electronic phase transition in colossal magnetoresistive manganese perovskites: La_0.65Sr_0.35MnO₃

Authors

• Hani Dulli, University of Tennessee, KnoxvilleFollow
• E. Ward Plummer, University of Tennessee, KnoxvilleFollow
• Peter A. Dowben, University of Nebraska-LincolnFollow
• Jaewu Choi, University of Nebraska-LincolnFollow
• Sy_Hwang Liou, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

7-24-2000

Comments

Published Applied Phys. Lett. 77 (2000) 570-572. Permission to use.

Abstract

We have observed a distinct surface phase transition for an important class of giant magnetoresistance materials [La_1-x Sr_x MnO₃ (x = 0.35)]. The surface phase transition occurs at 240 K compared to 370 K for the bulk and is fundamentally different. In the bulk, a ferromagnetic metal to paramagnetic bad-metal transition occurs, while the lower-temperature surface transition is from an insulator to a semimetal. The surface of this manganese perovskite is electronically and compositionally quite different from the bulk with important implications for the behavior of artificially grown layered transition-metal oxides and for the use of surface sensitive techniques to probe the bulk. ©2000 American Institute of Physics.