Abstract
We report x-ray scattering studies of diffuse peaks in the paramagnetic insulating phase of La0.7Ca0.3MnO3. The peaks occur at a (0.5 0 0)/(0 0.5 0)-type wavevector, and are found to disappear abruptly upon cooling through the transition into the ferromagnetic metallic phase. Based on the wavevector and measured correlation length of 1–2 lattice constants, the peaks are found to be consistent with the formation of CE-type bipolarons, and their collapse at Tc is attributed to the energy gain associated with itineracy in the ferromagnetic state.
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C.S. Nelson et al., in preparation.
Twinning of the sample and the width of the diffuse peaks make it impossible to determine whether or not there is a unique ordering wavevector.
The correlation lengths are defined as ξa≡a/2πΔH and ξb≡b/2πΔK, where a and b are the lattice constants and ΔH and ΔK are the HWHM values of the diffuse peaks along H and K,respectively.
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Nelson, C.S. et al. (2001). X-ray Scattering Studies of Correlated Polarons in La0.7Ca0.3MnO3 . In: Kaplan, M.D., Zimmerman, G.O. (eds) Vibronic Interactions: Jahn-Teller Effect in Crystals and Molecules. NATO Science Series, vol 39. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0985-0_22
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DOI: https://doi.org/10.1007/978-94-010-0985-0_22
Publisher Name: Springer, Dordrecht
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