Orbital Magnetoresistance in the LaSrCuO System

TL;DR

This study investigates the orbital magnetoresistance in La(2-x)Sr(x)CuO(4) thin films, revealing complex temperature and doping dependencies that challenge simple proportionality assumptions.

Contribution

It provides detailed measurements across various doping levels and compositions, highlighting the nuanced behavior of magnetoresistance in the LaSrCuO system.

Findings

Magnetoresistance not proportional to tangent squared of Hall angle near x=0.15 at high temperatures

Temperature dependence varies with doping level, especially for x < 0.15

Similar magnetoresistance behavior observed despite differences in resistivity and Hall effects

Abstract

Measurements of resistivity, Hall effect, and magnetoresistance have been made on seven c-axis oriented thin-film specimens of La(2-x)Sr(x)CuO(4) with values of x from 0.048 to 0.275, and one specimen that also contains Nd. The orbital magnetoresistance is found not to be proportional to the square of the tangent of the Hall angle except for values of x near 0.15 above about 80K. For smaller values of x the temperature dependence of the magnetoresistance is different, but quite similar in the various specimens, in spite of large differences in resistivity, Hall coefficient, and Hall angle.