Casa D, Keimer B, von Zimmermann M, Hill JP, Habermeier HU, Razavi FS
PHYSICAL REVIEW B
64 (10): Art. No. 100404 SEP 1 2001
An interesting memory effect occurs when La1-xSrxMnO3 (x similar to 1/8) is repeatedly exposed to x rays. While the "dark" conductivity remains unaffected 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 provide a qualitative explanation of this unusual effect in terms of three distinct states with different orbital correlations.