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Correlated Electron Behavior in Single Crystals Grown by Molten Metal Flux : : MnAs and Ce1̳-̳̳x̳Ybx̳CoIn₅

Abstract

Investigations into flux techniques for producing reliable and consistent single crystals were conducted for ongoing studies on correlated electrons systems : MnAs, Ce(1- x)Yb₅CoIn₅, and La(1-x)MxOBis₂. MnAs, as a potential candidate for energy efficient materials, has been recently synthesized in bulk, single crystals to understand the nature of the magnetocaloric effect and its correlation to potential magnetic refrigeration techniques. Single crystals were grown in a molten metal flux and characterization focused on the first and second order transitions. CeCoIn₅ has received a great deal of attention in recent years due to its exotic normal state behavior and possibly magnetically mediated superconductivity. Ytterbium was substituted into parent compound CeCoIn₅ to assist in the ongoing investigations into the potential valence transition with increasing Yb located at the Cerium sites. A reinterpretation of the valence fluctuations and cooperations based off previous measurements is suggested. Characterization was performed at temperatures down to 0.36 K at Quantum Design for the compound La(1-x)MxOBiS₂

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