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Raman Scattering Evidence of a Disordered Structural Phase Transition in La1.475Nd0.4Sr0.125CuO4

Published

Author(s)

B Nachumi, N Ichikawa, Y Nakamura, S Uchida

Abstract

We investigated the temperature and polarization dependence of the Raman scattering intensity of a single crystal sample of La1,475Nd0.4Sr0.125CuO4 which is known to exhibit antiphase stripe magnetic/charge order below T = 30K. The phonon spectra show peaks split according to the mass of the cations. Below a structural phase transition at about 60 K, one of the heavier-mass peaks softens significantly. Since this structural transition is also associated with the inequivalence of planar oxygen sites, this result suggests that cation disorder directly induces distortions of the CuO2 plane. There is also a possible signature of charge ordering in the electronic continuum beneath the phonon spectrum.
Citation
Physical Review B (Condensed Matter and Materials Physics)
Volume
63
Issue
No. 9

Keywords

cation disorder, cuprate, Raman scattering, structural transition

Citation

Nachumi, B. , Ichikawa, N. , Nakamura, Y. and Uchida, S. (2001), Raman Scattering Evidence of a Disordered Structural Phase Transition in La<sub>1.475</sub>Nd<sub>0.4</sub>Sr<sub>0.125</sub>CuO<sub>4</sub>, Physical Review B (Condensed Matter and Materials Physics) (Accessed April 16, 2024)
Created March 1, 2001, Updated February 17, 2017