Evidence for Magnetic Pseudoscaling in Overdoped La(2-x)Sr(x)CuO(4)

TL;DR

This study uses Raman scattering to investigate the electronic properties of overdoped La(2-x)Sr(x)CuO(4), revealing a crossover to pseudoscaling behavior around 160 K consistent with a nearly antiferromagnetic Fermi liquid model.

Contribution

First experimental evidence of magnetic pseudoscaling crossover in overdoped La(2-x)Sr(x)CuO(4) using Raman scattering, supporting the nearly antiferromagnetic Fermi liquid theory.

Findings

Gamma(T) decreases linearly from 300 K to 175 K

Crossover to pseudoscaling regime at T(cr)=160 K

No pseudogap observed in overdoped sample

Abstract

We report the results of electronic Raman scattering experiments on an overdoped La(1.78)Sr(0.22)CuO(4) single crystal as a function of temperature. The scattering rate Gamma(w->0,T) has been determined from the normal state B(1g) spectra in the range 50 K < T < 300 K. Gamma(T) decreases linearly from 300 K to about 175 K and then undergoes a reduction with respect to the expected mean-field behavior. This trend suggests a crossover to pseudoscaling regime at about T(cr)=160 K. The results are in good agreement with the prediction of the nearly antiferromagnetic Fermi liquid model. There is no evidence of a pseudogap in the spectra obtained from this overdoped sample.