Out-of-plane magnetoresistivity for fields parallel to the c axis in single-crystalline (La1−xSrx)2 CuO4

The c-axis magnetoresistivity as a function of temperature T and field H for fields parallel to the c axis is experimentally investigated for single-crystalline (La1−xSrx)2CuO4 (x=0.068). It is argued that the observed Lorentz force free magnetoresistive phenomena cannot be accounted for by previously considered mechanisms. By contrast, they can be explained by the extended Josephson coupling model, which takes into account both effective thermal energy and anisotropy. Based on this extended model, it is shown that all the magnetoresistivity curves obtained in H//I//c at various constant temperatures could be nicely scaled onto a single curve without any adjustable parameter in a wide transition region