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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
Manganese Oxides
Doped Lamno3
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.
Other Identifiers: 0022-3697
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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