A. Lacerda et al., MAGNETORESISTANCE IN THE NORMAL-STATE OF LA1.925SR0.075CUO4+DELTA, Physical review. B, Condensed matter, 49(13), 1994, pp. 9097-9102
The in-plane magnetoresistance of a high-quality single crystal of La1
.925Sr0.075CuO4+delta has been measured in both the high-symmetry tran
sverse geometry and in the longitudinal geometry. In both orientations
, the magnetoresistance is positive and shows conventional weak-field
behavior. The measured longitudinal magnetoresistance, however, is fou
nd to be almost an order of magnitude smaller than the measured transv
erse magnetoresistance. A semiphenomenological theory based on anisotr
opic scattering from hypothesized hole-pocket Fermi surfaces is introd
uced, which can account for the latter positive effect, as well as for
known Hall-effect measurements. We predict that, in the limit corresp
onding to perfectly coherent in-plane hole motion along (pi,pi), there
should be no saturation effect in the high-symmetry transverse magnet
oresistance.