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The effects of the cooperative Jahn-Teller effect on the crystal structureand the stability of the charge ordered (CO) state were studied by measurementsof powder X-ray diffraction, resistivity, and ultrasound for Pr1-xCaxMnO3(0.5<=x<=0.875). Powder X-ray diffraction revealed a change of the crystalstructure from tetragonally compressed to tetragonally elongated orthorhombicbetween x=0.75 and x=0.8 in the CO state, resulting from the crossover of thecooperative Jahn-Teller vibration mode from Q2 to Q3. The relative stiffeningof the ultrasound (DeltaV/V) reflecting the magnitude of the cooperativeJahn-Teller lattice distortion in the CO state increases with increasing x from0.5 to 0.625, reaching the largest and being almost x-independence for0.625<x<0.8, and drops steeply with further increase of x. Coincident with thevariation of the DeltaV/V with x, the stability of the CO state reflected bythe magnetoresistance effect increases with increasing x from 0.5 to 0.625,reaching the most stable for 0.625<x<0.825, and becomes unstable with furtherincrease of x. These features demonstrate that the cooperative Jahn-Tellerlattice distortion is one of the key ingredients in understanding the essentialphysics of the CO state in manganites.Comment: 26 pages, 8 figures. To be published in Phys. Rev.

physical review. b, condensed matter and materials physics

Transport, ultrasound, and structural properties for the charge-ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:msub><mml:mtext>Ca</mml:mtext><mml:mi>x</mml:mi></mml:msub></mml:mrow><mml:mrow /></mml:msub><mml:msub><mml:mrow><mml:mtext>MnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:…

Transport, ultrasound, and structural properties for the charge-orderedPr1−xCaxMnO3