Mixed lattice and electronic states in high-temperature superconductors.
Inelastic neutron scattering measurements are presented which show the abrupt development of new oxygen lattice vibrations near the doping-induced metal-insulator transition in La(2--x)Sr(x)CuO(4). A direct correlation is established between these lattice modes and the electronic susceptibility (as measured by photoemission) inferring that such modes mix strongly with charge fluctuations. This electron-lattice coupling can be characterized as a localized one-dimensional response of the lattice to short-ranged metallic charge fluctuations.
McQueeney
R J
RJ
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. mcqueeny@lanl.gov
Sarrao
J L
JL
Pagliuso
P G
PG
Stephens
P W
PW
Osborn
R
R