Pressure effects on the transport and magnetic properties of La1.4Sr1.6Mn2O7
Journal
Physical Review B
Journal Volume
58
Journal Issue
18
Pages
12224-12229
Date Issued
1998
Author(s)
Chang, C. F.
Chou, P. H.
Tsay, H. L.
Weng, S. S.
Chatterjee, S.
Yang, H. D.
Shen, C. H.
Li, W. H.
Abstract
The effects of external (hydrostatic) pressure and internal (chemical) pressure on the transport and magnetic properties of the (Formula presented) are investigated. Both metal-insulator transition temperature (Formula presented) and Curie temperature (Formula presented) increase with the increase of external pressure. In contrast, the (Formula presented) and (Formula presented) decrease with the increase of Ca content in (Formula presented) where the internal pressure is supposed to be introduced. External pressure enlarge the ferromagnetic metal phase through the pressure-enhanced transfer interaction of the charge carriers. The Mn-O-Mn bond angle remains almost unchanged with the increase of Ca content which is in sharp contrast to the (Formula presented) system. The Mn-O(3) bond length is decreased by the external pressure while increased by the internal pressure. It is interpreted that the opposite behaviors of (Formula presented) and (Formula presented) for external and internal pressures are due to the different variations of Mn-O(3) bond length. All other results are discussed and compared with those in the (Formula presented) system. © 1998 The American Physical Society.
Type
journal article