Unusual x-ray transport phenomena in La1-xSrxMnO3

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Casa D, Keimer B, von Zimmermann M, Hill JP, Habermeier HU, Razavi FS

Abstract:
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.