Abstract
Structural properties of La2CuO4.1 single crystal are studied by high-resolution synchrotron X-ray diffraction as a function of temperature and of X-ray fluence. Superstructures with a periodicity 2, along the c axis, due to a 3D long-range oxygen ordering, have been observed. The temperature-dependent study has allowed us to distinguish two order–disorder phase transitions, at 350 and 375 K for two different ordered phases, respectively. After rapid quenching from 380 to 100 K we were able to induce disorder-to-order-like transition because of a 2D rearrangement of the excess oxygen atoms in the temperature range of 130–180 K. The oxygen ordering could also be produced by X-ray beam illumination; a clear signature of X-ray-photo-induced phase transition has been found by placing the sample under high X-ray flux at 300 and 220 K.
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Campi, G., Dell'omo, C., Di Castro, D. et al. Effect of Temperature and X-Ray Illumination on the Oxygen Ordering in La2CuO4.1 Superconductor. Journal of Superconductivity 17, 137–142 (2004). https://doi.org/10.1023/B:JOSC.0000011857.49035.bd
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DOI: https://doi.org/10.1023/B:JOSC.0000011857.49035.bd