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- W2201611220 abstract "We have investigated the Jahn-Teller transition accompanied by orbital order-disorder transition in La{sub 1-x}Ca{sub x}MnO{sub 3} by high temperature x-ray powder diffraction with synchrotron radiation and resistivity measurements. The unit cell volume of LaMnO{sub 3} decreases with increasing temperature in a narrow temperature range below T{sub JT}{approx_equal}750 K and then undergoes a volume collapse at T{sub JT}. The transition is first order. Similar behavior is also obtained in Ca-doped La{sub 1-x}Ca{sub x}MnO{sub 3} for x=0.025 and 0.075. The amount of volume collapse, however, decreases with the doping and also the first order discontinuous transition crosses over to a quasi-continuous transition with doping. We interpret the volume contraction at the transition is due to a more efficient packing of the MnO{sub 6} octahedra in the orbitally liquid state and the crossover from the discontinuous to the quasi-continuous transition is due to the change in the anharmonic coupling parameter with the hole doping. The resistivity of LaMnO{sub 3} decreases as a function of temperature and then shows abrupt drop at T{sub JT} becoming almost temperature independent at higher temperature. The resistivity of La{sub 1-x}Ca{sub x}MnO{sub 3} also decreases at T{sub JT} but the abrupt drop becomes smeared out at higher doping. Themore » similar behavior of the unit cell volume and the resistivity at the Jahn-Teller transition suggests that the volume contraction at T{sub JT} causes delocalization of e{sub g} electrons.« less" @default.
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- W2201611220 date "2006-03-01" @default.
- W2201611220 modified "2023-09-24" @default.
- W2201611220 title "Volume contraction and resistivity drop at the Jahn-Teller transition in La{sub 1-x}Ca{sub x}MnO{sub 3}" @default.
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