| Original Articles |
|
|
|
|
Colossal Magnetoresistance Without Double Exchange Mechanism in Spinel FeCr2S4 |
| SHI Lei;DONG Qiu-zhao;YANG Zhao-rong;CHEN Zhi-wen;ZHANG Yu-heng |
| Structure Research Laboratory, University of Science and Technology of China, Hefei 230026
and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing University, Nanjing 210093
|
|
| Cite this article: |
|
SHI Lei, DONG Qiu-zhao, YANG Zhao-rong et al 1999 Chin. Phys. Lett. 16 532-534 |
|
|
|
Abstract The crystal structure of spinel FeCr2S4, which shows a semiconductor-metal transition and paramagnetic-ferrimagnetic transition at Tc = 170K , was determined by x-ray powder diffraction. It is found that the spinel FeCr2S4 belongs to a normal spinel structure [Fe2+]t[Cr3+2]oS4. The result clearly shows that the spinel FeCr2S4 has neither mixed valence of Fe3+ and Fe2+ ions or Cr3+ and Cr2+ ions for a double-exchange magnetic interaction, nor a Jahn-Teller cation such as Cr3+. The spinels represent a distinct class of colossal magnetoresistance materials, with magnetic ordering driven by superexchange rather than double exchange.
|
| Keywords:
72.90.+y
75.30.Et
61.50.Em
|
|
|
Published: 01 July 1999
|
|
| PACS: |
72.90.+y
|
(Other topics in electronic transport in condensed matter)
|
| |
75.30.Et
|
(Exchange and superexchange interactions)
|
| |
61.50.Em
|
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
