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Transport and magnetic properties in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal">Ba</mml:mi><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5.45</mml:mn></mml:msub></mml:mrow></mml:math>: Focus on the high-temperature transition
The electronic transport properties and the magnetic susceptibility were measured in detail in $\mathrm{Y}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5.45}$. Close to the so-called metal-insulator transition, strong effects of resistance relaxation, a clear thermal hysteresis, and a sudden increase of the resistance noise are observed. This is likely due to the first order character of the …