Enhancement of electronic anomalies in iron-substituted La_2-x_Sr_x_Cu_1-y_Fe_y_O_4_ around x=0.22

TL;DR

This study investigates how Fe substitution enhances electronic anomalies in La_2-x_Sr_x_Cu_1-y_Fe_y_O_4_, revealing increased resistivity and suppressed superconductivity around x=0.22, possibly linked to stripe correlations.

Contribution

It provides new insights into the effects of Fe substitution on electronic properties and anomalies near x=0.22 in La_2-x_Sr_x_CuO_4_.

Findings

Resistivity shows large values and low-temperature upturn near x=0.22

Superconducting transition temperature T_c_ is suppressed around x=0.22

Fe substitution enhances electronic anomalies possibly related to stripe correlations

Abstract

We have measured the temperature dependences of Rho and Chi for Fe-substituted La_2-x_Sr_x_Cu_1-y_Fe_y_O_4_ in the overdoped regime, in order to investigate Fe-substitution effects on electronic properties around x=0.22. From the Rho measurements, it has been found around x=0.22 that the values of Rho are large at room temperature and that Rho exhibits a pronounced upturn at low temperatures. Moreover, from the Rho and Chi measurements, it has been found that T_c_ is anomalously depressed around x=0.22. These results indicate that the electronic anomalies around x=0.22 are enhanced by Fe substitution, which might be related to the development of stripe correlations by Fe substitution.