Response of Acoustic Phonons to Charge and Orbital order in the 50% Doped Bilayer Manganite LaSr2Mn2O7.
F. Weber, S. Rosenkranz, J.-P. Castellan, R. Osborn, H. Zheng, J. F. Mitchell, Y. Chen, Song Xue Chi, Jeffrey W. Lynn, D. Reznik
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 (Tcoo = 225 K). This indicates a reduced electron-phonon coupling probably due to a decrease of electronic states at the Fermi level below Tdc00^.
Colossal Magnetoresistance, Phonon Energies, Phonon Linewidths, Inelastic neutron scattering, Charge Order, Orbital Order
, Rosenkranz, S.
, Castellan, J.
, Osborn, R.
, Zheng, H.
, Mitchell, J.
, Chen, Y.
, Chi, S.
, Lynn, J.
and Reznik, D.
Response of Acoustic Phonons to Charge and Orbital order in the 50% Doped Bilayer Manganite LaSr<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub>., Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908563
(Accessed December 6, 2023)