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arxiv: cond-mat/9909270 · v2 · submitted 1999-09-17 · ❄️ cond-mat.str-el

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
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G. Guentherodt L. Degiorgi P. Wachter J. M. Tranquada D. J. Buttrey
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classification ❄️ cond-mat.str-el
keywords conductivityorderstripeantiresonancebond-stretchingchargecharge-ordercharge-stripe
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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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