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Optical study of competition between ordering and metallicity in La(2-2x)Sr(1+2x)Mn(2)O(7)
- Kunze, J. (author)
- Naler, S. (author)
- Bäckström, Joakim (author)
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- Rubhausen, M. (author)
- Mitchell, J. F. (author)
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- 2003
- 2003
- English.
- In: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 67
- Journal article (peer-reviewed)
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- We study by spectroscopic ellipsometry the optical in-plane anisotropies in La(2-2x)Sr(1+2x)Mn(2)O(7) with 0.32less than or equal toxless than or equal to0.40 above and below the metal to insulator (MI) transition. Spectral-weight changes in the optical conductivity occur at a cross-over temperature T(’)=280 K for all dopings. Local ordering of orbital and charge degrees of freedom sets in doping dependently at temperatures of 145 Kless than or equal toT(*)less than or equal to310 K. Below the MI transition we observe for all dopings except x=0.36 a vanishing of the charge ordering and an isotropic and metallic state at low frequencies, whereas the local orbital ordering persists. For x=0.36 we observe two different characteristic developments of the ordering processes, one being compatible with the parabolic doping dependence on T(*) established by the other doping levels and the second showing ordering at a temperature slightly above the MI transition. We argue that our observations are compatible with a phase separation scenario.
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