Abstract
We report the observation of large low-field magnetoresistance (MR) behavior in with a perovskite-related structure. is semiconducting and orders ferromagnetically at 355 K. However, it has neither mixed valency of Mn for double-exchange magnetic interactions, nor Jahn-Teller ions, nor a metal-insulator transition. The MR smoothly increases with decreasing temperature and is at 20 K. The low-field MR response does not show the strong temperature-dependent decay characteristic of the perovskite-based systems and appears consistent with an intergrain-interdomain tunneling origin.
- Received 5 October 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.3164
©1999 American Physical Society