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The melting process of the orbital order in  Pr0.5Ca0.5MnO3 single crystal has been studied in detail as a function oftemperature by neutron diffraction. It is demonstrated that acommensurate-incommensurate (C-IC) transition of the orbital ordering takesplace in a bulk sample, being consistent with the electron diffraction studies.The lattice structure and the transport properties go through drastic changesin the IC orbital ordering phase below the charge/orbital ordering temperature  Tco/oo, indicating that the anomalies are intimately related to the partialdisordering of the orbital order, unlike the consensus that it is related tothe charge disordering process. For the same T range, partial disorder of theorbital ordering turns on the ferromagnetic spin fluctuations which wereobserved in a previous neutron scattering study.Comment: 5 pages, 2 figures, REVTeX, to be published in Phys. Rev.

physical review. b, condensed matter

Commensurate-incommensurate transition in the melting process of orbital ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</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">Ca</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="…

Commensurate-incommensurate transition in the melting process of orbital ordering inPr0.5Ca0.5