Response of Acoustic Phonons to Charge and Orbital order in the 50% Doped Bilayer Manganite LaSr2Mn2O7.

Published

November 9, 2011

Author(s)

F. Weber, S. Rosenkranz, J.-P. Castellan, R. Osborn, H. Zheng, J. F. Mitchell, Y. Chen, Song Xue Chi, Jeffrey W. Lynn, D. Reznik

Abstract

We report an inelastic neutron scattering study of acoustic phonons in the charge and orbitally ordered bilayer manganite LaSr₂. For excitation energies less than 15 meV, we observe an abrupt increase (decrease) of the phonon energies (linewidths) of a transverse acoustic phonon branch at q=(h,h,0), h less than or equal to} 0.3, upon entering the low temperature charge and orbital ordered state (T_{coo = 225 K). This indicates a reduced electron-phonon coupling probably due to a decrease of electronic states at the Fermi level below T}dc00^.

Citation

Physical Review Letters

Volume

107

Issue

20

Pub Type

Journals

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Keywords

Colossal Magnetoresistance, Phonon Energies, Phonon Linewidths, Inelastic neutron scattering, Charge Order, Orbital Order

Citation

Weber, F. , Rosenkranz, S. , Castellan, J. , Osborn, R. , Zheng, H. , Mitchell, J. , Chen, Y. , Chi, S. , Lynn, J. and Reznik, D. (2011), Response of Acoustic Phonons to Charge and Orbital order in the 50% Doped Bilayer Manganite LaSr₂Mn₂O₇., Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908563 (Accessed October 13, 2025)