Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr$_2$Mn$_2$O$_7$

F. Weber; S. Rosenkranz; J. -P. Castellan; R. Osborn; H. Zheng; J. F. Mitchell; Y. Chen; Songxue Chi; J. W. Lynn; D. Reznik

doi:10.1103/PhysRevLett.107.207202

paper

Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr $_{2}$ Mn $_{2}$ O $_{7}$

arXiv:1111.1914 · doi:10.1103/PhysRevLett.107.207202

Abstract

We report an inelastic neutron scattering study of acoustic phonons in the charge and orbitally ordered bilayer manganite LaSr $_{2}$ Mn $_{2}$ O $_{7}$ . 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 $q = (h, h, 0)$ , $h \leq 0.3$ , upon entering the low temperature charge and orbital ordered state ( $T_{C O O} = 225 K$ ). This indicates a reduced electron-phonon coupling due to a decrease of electronic states at the Fermi level leading to a partial removal of the Fermi surface below $T_{C O O}$ and provides direct experimental evidence for a link between electron-phonon coupling and charge order in manganites.

accepted in Physical Review Letters

Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr $_{2}$ Mn $_{2}$ O $_{7}$

Abstract

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Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr2​Mn2​O7​

Abstract

References in corpus (7)

Cited by in corpus (7)

Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr $_{2}$ Mn $_{2}$ O $_{7}$