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Title: | Giant Magnetoresistance, Charge Ordering And Other Novel Properties Of Perovskite Manganates |
Authors: | Rao, C N R Mahesh, R Raychaudhuri, A K Mahendiran, R |
Keywords: | electrical properties magnetic properties Insulator-Metal Transition Double-Exchange Ferromagnet Colossal-Magnetoresistance Manganese Oxides Doped Lamno3 Transport-Properties Electronic-Structure Magnetic-Field Phase-Diagram La1-Xsrxmno3 |
Issue Date: | Apr-1998 |
Publisher: | Pergamon Elsevier Science Ltd |
Citation: | Journal Of Physics And Chemistry Of Solids 59(4), 487-501 (1998) |
Abstract: | Giant magnetoresistance (GMR) and related properties of manganate perovskites of the general formula Lnl − xAxMnO3 (Ln = rare earth; A = divalent ion) are discussed in detail. There is a fine interplay of magnetic exchange, structural properties and electronic transport in these materials which gives rise to several novel properties. The manganates are ferromagnetic at or above a certain value of x (or Mn4+ content) and become metallic at temperatures below the curie temperature, Tc. This behavior is attributed to double-exchange. 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 〉 or pressure. The commonalities and correlations found in the properties of manganates are examined along with certain unusual features in the electron-transport properties of these materials. Some of the Ln1 − xAxMnO3 compositions exhibit charge-ordering and related effects. Charge ordering is crucially dependent on 〈 rA 〉 or the eg band width and the charge-ordered insulating state transforms to a metallic ferromagnetic state on the application of a magnetic field, charge-ordering and double-exchange being competing interactions. |
Description: | Proceedings Paper. Restricted Access. |
URI: | https://libjncir.jncasr.ac.in/xmlui/10572/1065 |
Other Identifiers: | 0022-3697 |
Appears in Collections: | Research Papers (Prof. C.N.R. Rao) |
Files in This Item:
File | Description | Size | Format | |
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sl.no26.1998.J. Ph.vs Chem Sol 59(4). 487-502..pdf Restricted Access | 1.42 MB | Adobe PDF | View/Open Request a copy |
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