TY  - JOUR
AU  - Freeman, P. G.
AU  - Giblin, S. R.
AU  - Hradil, K.
AU  - Mole, R. A.
AU  - Cermak, P.
AU  - Prabhakaran, D.
TI  - Magnetic excitations of the charge stripe electrons below half doping in La$_{2−x}$Sr$_x$NiO$_4$ ($x$ = 0.45, 0.4)
JO  - Physical review / B
VL  - 95
IS  - 6
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-01566
SP  - 064403
PY  - 2017
N1  - Magnetism and basic research related
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000396095500004
DO  - DOI:10.1103/PhysRevB.95.064403
UR  - https://juser.fz-juelich.de/record/827438
ER  -