%0 Journal Article
%A Freeman, P. G.
%A Giblin, S. R.
%A Hradil, K.
%A Mole, R. A.
%A Cermak, P.
%A Prabhakaran, D.
%T Magnetic excitations of the charge stripe electrons below half doping in La$_{2−x}$Sr$_x$NiO$_4$ ($x$ = 0.45, 0.4)
%J Physical review / B
%V 95
%N 6
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2017-01566
%P 064403
%D 2017
%Z Magnetism and basic research related
%X The low energy magnetic excitation spectrum of charge stripe ordered La2-xSrxNiO4, x=0.4 and x=0.45 samples, were studied by neutron scattering. Two excitation modes are observed in both materials, one from the ordered magnetic moments, and a second mode consistent with pseudo-one-dimensional antiferromagnetic excitations of the charge stripe electrons (q-1D). The dispersion of the q-1D excitation follows the same relation as in x=1/3 composition, with even spectral weight in the two counterpropagating branches of the x=0.4 sample, however in the x=0.45 sample only one dispersion branch has any measurable spectral weight. The evolution of the q-1D excitations on doping to the checkerboard charge ordered phase is discussed.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000396095500004
%R 10.1103/PhysRevB.95.064403
%U https://juser.fz-juelich.de/record/827438