Unusual Electric Field Effects in Nd0.7Sr0.3MnO3

Abstract

Enhanced electric field (E) induced modulation of the resistance of epitaxial thin films of N${\mathrm{d}}_{0.7}$S${\mathrm{r}}_{0.3}$Mn${\mathrm{O}}_3$ has been observed. The results show several remarkable features: first, field-direction-independent decrease of the resistance above the temperature at which the peak in resistivity occurs $\left(T_p\right)$; second, proportionality of the modulation to $E^2$; third, a reduction in the magnitude and field-direction-independent reversal of the sign of $\Delta R/R$ just below $T_p$; and fourth, a prompt time response at high temperatures and a slower response near $T_p$. These results are consistent with a model of a polarization-induced lattice distortion coupling with both spin and charge transport.