The Phenomenon of Colossal Magnetoresistance and Some Experimental Results
Journal Title: International Journal of Fundamental Physical Sciences - Year 2014, Vol 4, Issue 1
Abstract
The Present LaMn03 material is antiferromagnetic and insulting while replacing La with alkaline earth atoms changes take place in symmetry and crystal structure. Ferromagnetic interaction, for example, increases with dopant concentration X and attains a maximum at X=0.31, beyond this level different type of antiferromagnetic interaction intra as well as inter-layer, emerge which grown the overall magnetic behavior of the compound. We discuss semi covalent exchange interactions of four types. The nature of exchange viewed with the degree of overlap of the empty Mn 3d level and the field O2 p level. Then the most interesting case is Mn3+-O2-Mn4+ where the exchange between Mn3+ and Mn4+ take place through hopping of holes at levels from Mn4+ to Mn3+ Via O2-. At each site the mobile hole spin is parallel to the localized case spin at
Authors and Affiliations
Haji Shirinzadeh
Keywords
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- EP ID EP599192
- DOI 10.14331/ijfps.2014.330062
- Views 76
- Downloads 0
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