A Y Ramos et al 2009 J. Phys.: Conf. Ser. 190 012096 doi:10.1088/1742-6596/190/1/012096
A Y Ramos1, H C N Tolentino1, N M Souza-Neto2, A Caneiro3, Y Joly1, J P Itié4, A M Flank4 and P Lagarde4
Show affiliationsThe present study aims, by using X-ray Absorption Spectroscopy, to describe the local process towards the pressure-induced abrupt changes in the resistivity in the Jahn-Teller distorted LaMnO3 doped compounds. Local environment of manganese atoms under pressure up to 37 GPa has been studied by X-ray absorption spectroscopy. We identify successive steps towards the pressure-induced abrupt changes in the resistivity. These steps are associated to local processes such as the opening of the inter-octahedra tilt angles and the average symmetrization of the Mn local environment. All modifications present a hysteretic behavior when the pressure is released, pointing to the coexistence of MnO6 distorted and undistorted units.
78.70.Dm X-ray absorption spectra
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
62.50.-p High-pressure effects in solids and liquids
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 1 (2009)
A Y Ramos et al 2009 J. Phys.: Conf. Ser. 190 012096
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