Stripe Conductivity in La(1.775)Sr(0.225)NiO(4)
Yu. G. Pashkevich, V. A. Blinkin, V. P. Gnezdilov, V. V. Tsapenko, V., V.Eremenko, P. Lemmens, M. Fischer, M. Grove, G. Guentherodt, L. Degiorgi, P., Wachter, J. M. Tranquada, D. J. Buttrey
TL;DR
This study investigates stripe order in La(1.775)Sr(0.225)NiO(4) using Raman and optical measurements, revealing phonon behavior and dynamical conductivity associated with charge stripes.
Contribution
It provides new insights into the phonon modes and dynamical conductivity related to stripe order in nickelate materials.
Findings
Extra phonon peaks linked to charge-order wave vector
Fano antiresonance indicates finite dynamical conductivity
Charge stripes influence phonon and optical properties
Abstract
We report Raman light-scattering and optical conductivity measurements on a single crystal of La(1.775)Sr(0.225)NiO(4) 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.
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