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Author Panda, S. ♦ Rout, G. C.
Source IACS Kolkata
Content type Text
Publisher Indian J. Phys.
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Colossal magnetoresistance ♦ Charge density wave ♦ Localized states
Abstract We propose a model to study the magnetic phase transition in theColossal-Magneto-Resistance (CMR) material of general type R1–xAxMnO3(R = La, Sm,Nd; A = Ca, Sr, Ba). The model Hamiltonian consists of a Charge Density Wave (CDW)gap in the eg-band and the strong magnetic field due to the spin ordering in thelocalized tgcore electrons. The Hamiltonian is solved by using Zubarev’s Green’sfunction technique to calculate CDW gap (.) and magnetization (Md)in t2g band. Bothof them are solved self-consistently. Their combined effect on the temperaturedependent magnetization (Mc) due to the eg band electrons is investigated. Both themagnitude and the transition temperature of (Mc) are strongly influenced by both .and Md. Hence the hopping of the band electrons are strongly controlled by these twolong range interactions. The results are discussed by varying the model parametersof the manganite system.
Education Level UG and PG
Learning Resource Type Article
Journal Indian J Phys
Volume Number 83
Issue Number 4
Page Count 8
Starting Page 465
Ending Page 472