Variable-range-hopping conductivity of half-doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$

X. J. Chen, C. L. Zhang, J. S. Gardner +2

We report measurements of in-plane ${\rho }_{ab}$ and out-of-plane ${\rho }_c$ resistivities on a single crystal of the half-doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$. In the tempera…