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

Published

March 1, 2001

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 La_1,475Nd_0.4Sr_0.125CuO₄ 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

Pub Type

Journals

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_1.475Nd_0.4Sr_0.125CuO₄, Physical Review B (Condensed Matter and Materials Physics) (Accessed December 26, 2024)