Normal- and superconducting-state properties of La1.85Sr0.15CuO4

Abstract

We report results of resistivity, magnetoresistance, transition-temperature, and upper-critical-field measurements for ${\mathrm{La}}_{1.85}$ ${\mathrm{Sr}}_{0.15}$ ${\mathrm{CuO}}_4$. We derive values for the coherence length, mean free path, and electronic specific heat and compare our results with Ba(Pb,Bi)${\mathrm{O}}_3$. We conclude that phonon-mediated superconductivity can explain the high transition temperatures in these materials.