New advanced magnetic La-1.2(Sr1.8-xCax)Mn2O7 compounds with colossal magnetoresistance

Authors
Liu, RS Shen, CH Hu, SF Lin, JG Huang, CY
Citation
Rs. Liu et al., New advanced magnetic La-1.2(Sr1.8-xCax)Mn2O7 compounds with colossal magnetoresistance, J MAGN MAGN, 209(1-3), 2000, pp. 113-115
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
209
Issue
1-3
Year of publication
2000
Pages
113 - 115
Database
ISI
SICI code
0304-8853(200002)209:1-3<113:NAMLCW>2.0.ZU;2-0
Abstract
We present electrical, magnetic and crystal structure for a series of La-1. 2(Sr1.8-xCax)Mn2O7 (x = 0-0.8) manganites. The sample of x = 0.4 exhibits t he highest magnetoresistance (MR) ratio [rho(H) - p(O)/rho(H)] x 100% of - 108% at the temperature of 102 K. The Curie temperature (Tc) decreases from 135 K for x = 0-102 K for x = 0.4. The hysteresis phenomenon was observed when the temperatures were lower than the magnetic transition temperature. The static strain within the compound for x = 0.4 has also been found by hi gh-resolution transmission electron microscopic techniques. (C) 2000 Elsevi er Science B.V. All rights reserved.