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PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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Electronic Structure of Ca 0.86 Pr 0.14 MnO 3 97<br />

5.1 Introduction<br />

The strong interplay among charge, spin, lattice and orbital degrees of freedom of electrons<br />

form the basis of the phenomena of colossal magnetoresistance (CMR) shown<br />

by manganites. To a large extent the traditional models [1, 2, 3] employing the<br />

charge-spin coupling, have been able to explain the CMR in many of the hole doped<br />

compositions (R 1−x A x MnO 3 with x

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