Tripathy, Satya Narayan (2013) Structural and Transport Properties of the series Eu1-xSrxMnO3 (0 x 1). MSc thesis.
We have studied in detail the structural and transport aspect of the series of manganites Eu1-xSrxMnO3. Starting with the parent composition in this family of compounds EuMnO3 which is rather an antiferromagnetic insulator, we have investigated how the electronic transport varies with higher concentration of Sr in these compounds vis-a-vis with structures. A series of samples have been prepared through solid state reaction route from the high purity constituent materials. The structural characterization is carried out by XRD with Retieveld analysis. Most of the samples in the series crystallises under orthorhombic structures with Pnma space group. With increasing concentration of Sr, the sample tends to more symmetric in nature. The SEM imaging renders the proper granular structures of the samples in the series. Moreover, a detail investigation is carried out for the transport features of the materials. The temperature dependence of resistivity shows unique features with varied concentrations of the Sr. With a lower concentrations favours the insulating state of the materials to that of semiconducting with increasing the content of Sr on the rare earth side of the parent manganite. The features are described in terms of the double exchange model with the support of structural parameters calculated for each material.
|Thesis ( MSc)
|Charge ordering, double exchange interaction ,John-teller effect, colossal magneto resistance
|Physics > Condensed Matter
|Sciences > Department of Physics
|12 Dec 2013 09:57
|20 Dec 2013 15:48
|Dash , S
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