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Single crystals of the systems Pr0.5(Ca1-xSrx)0.5MnO3,(Pr1-yYy)0.5(Ca1-xSrx)0.5MnO3, and Sm0.5Sr0.5MnO3 were grown to provide aseries of samples with fixed ratio Mn(III)/Mn(IV)=1 having geometric tolerancefactors that span the transition from localized to itinerant electronicbehavior of the MnO3 array. A unique ferromagnetic phase appears at thecritical tolerance factor tc= 0.975 that separates charge ordering andlocalized-electron behavior for t<tc from itinerant or molecular-orbitalbehavior for t>tc. This ferromagnetic phase, which has to be distinguished fromthe ferromagnetic metallic phase stabilized at tolerance factors t>tc,separates two distinguishable Type-CE antiferromagnetic phases that aremetamagnetic. Measurements of the transport properties under hydrostaticpressure were carried out on a compositions t a little below tc in order tocompare the effects of chemical vs. hydrostatic pressure on the phases thatcompete with one another near t=tc.Comment: 10 pages. To be publised in Phys. Rev.

physical review. b, condensed matter

Phase competition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>L</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>…

Phase competition inL0.5A0.5MnO3…