dc.contributor.author |
Rao, C N R
|
|
dc.contributor.author |
Cheetham, A K
|
|
dc.contributor.author |
Mahesh, R
|
|
dc.date.accessioned |
2012-11-27T11:12:41Z |
|
dc.date.available |
2012-11-27T11:12:41Z |
|
dc.date.issued |
1996 |
|
dc.identifier |
0897-4756 |
en_US |
dc.identifier.citation |
Chemistry Of Materials 8(10), 2421-2432 (1996) |
en_US |
dc.identifier.uri |
https://libjncir.jncasr.ac.in/xmlui/10572/1105 |
|
dc.description |
Review. Restricted Access. |
en_US |
dc.description.abstract |
Giant magnetoresistance (GMR), which was until recently confined to magnetic layered and granular materials, as well as doped magnetic semiconductors, occurs in manganate perovskites of the general formula Ln(1-x)A(x)MnO(3) (Ln = rare earth; A = divalent ion). These manganates are ferromagnetic at or above a certain value of x (or Mn4+ content) and become metallic at temperatures below the curie temperature, Tc. GMR is generally a maximum close to Tc or the insulator-metal (I-M) transition temperature, Tim. The Tc and %MR are markedly affected by the size of the A site cation, 〈rA〉, thereby affording a useful electronic phase diagram when Tc or Tim is plotted against 〈rA〉. We discuss GMR and related properties of manganates in polycrystalline, thin-film, and single-crystal forms and point out certain commonalities and correlations. We also examine some unusual features in the electron-transport properties of manganates, in particular charge-ordering effects. Charge ordering is crucially dependent on 〈rA〉 or the e(g) band width, and the charge-ordered insulating state transforms to a metallic ferromagnetic state on the application of a magnetic field. |
en_US |
dc.description.uri |
http://dx.doi.org/10.1021/cm960201v |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
American Chemical Society |
en_US |
dc.rights |
© 1996 American Chemical Society |
en_US |
dc.subject |
Double-Exchange Ferromagnet |
en_US |
dc.subject |
Thin-Films |
en_US |
dc.subject |
Transport-Properties |
en_US |
dc.subject |
Colossal Magnetoresistance |
en_US |
dc.subject |
(La1-Xcax)Mno3 Films |
en_US |
dc.subject |
Defect Chemistry |
en_US |
dc.subject |
Room-Temperature |
en_US |
dc.subject |
Single-Crystals |
en_US |
dc.subject |
Magnetic-Field |
en_US |
dc.subject |
La1-Xsrxmno3 |
en_US |
dc.title |
Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems |
en_US |
dc.type |
Article |
en_US |