Stripe conductivity in La1.775Sr0.225NiO4
We report Raman light-scattering and optical conductivity measurements on a single crystal of La1.775Sr0.225NiO4 which exhibits incommensurate charge-stripe order. The extra phonon peaks induced by stripe order can be understood in terms of the energies of phonons that occur at the charge-order wave vector Q(c). A strong Fano antiresonance for a Ni-O bond-stretching mode provides clear evidence for finite dynamical conductivity within the charge stripes.
Pashkevich
YG
A. A. Galkin Donetsk Phystech NASU, 83114 Donetsk, Ukraine.
Blinkin
VA
Gnezdilov
VP
Tsapenko
VV
Eremenko
VV
Lemmens
P
Fischer
M
Grove
M
Guntherodt
G
Degiorgi
L
Wachter
P
Tranquada
JM
Buttrey
DJ