Unusual x-ray transport phenomena in La1-xSrxMnO3 - art. no. 100404

An interesting memory effect occurs when La1-xSrxMnO3 (x similar to 1/8) is repeatedly exposed to x rays. While the "dark" conductivity remains unaffe cted by the irradiation history, the conductivity is markedly enhanced upon exposure to x rays at low temperatures. Immediately after renewed exposure , it recovers the value attained at the end of the previous exposure. We pr ovide a qualitative explanation of this unusual effect in terms of three di stinct states with different orbital correlations.