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
Related Articles
- EP ID EP599192
- DOI 10.14331/ijfps.2014.330062
- Views 82
- Downloads 0
Retrospective Analysis of the Well-Known Experiments
We analyze ray path in the Sagnac and Michelson-Gale experimental setups and in the Michelson interferometer. Work of rotating interferometers is proved to be in full agreement with the concept of static ether. A theory...
On The Effect of Electron-Hole Recombination in Disordered GaAs-Aa1-xALAs Multi-quantum Well Structure
The disordered electron-hole recombination in multi-quantum well was investigated using analytical method based on the rate equations. The results show extreme broad distribution of the recombination time which depends e...
Re-evaluation of Fermi’s theory of beta-decay
Views Another published paper of the author proposes that proton and neutron radii have contraction inside the atomic nuclei, generating a discrepancy of 8s between the neutron lifetime measured in ...
Transportation in North East of the Iranian Plateau in Bronze Age
Northeast of Iran has been of crucial importance compared to other areas due to important routes crossing it. From the perspective of archaeologists, the expansion of regional and trans-regional trade exchanges is an evi...
The Electromagnetic Radiation Mechanism
This paper suggested a mechanism for Electromagnetic Radiation (EM-R); the mechanism is based on the Flip-Flop (F-F) of combined Circular Magnetic Field (CMF) and Electric Field (EF) produced by energetic charged particl...