Activation Energy of the Photo Induced Q2 Oxygen Ordered Phase in the La2CuO4.08 Superconductor |
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| Authors: | M Fratini G Campi L Simonelli V Palmisano S Agrestini M Filippi N L Saini A Bianconi |
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| Affiliation: | 1. Dipartimento di Fisica, Università di Roma “La Sapienza,” P. le Aldo Moro 2, 00185, Roma, Italy
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| Abstract: | The interstitial oxygen ordering in a La2CuO4+ y (y = 0.08) single crystal with a T c = 38 K has been investigated. We have studied the growth dynamics of the three dimensional (3D) ordered phase, called Q2, at different temperatures under X-ray illumination. The critical temperature T 0～334 K of the order-disorder transition for the Q2 phase has been determined. We have found that the illumination of the sample with a continuous polarized synchrotron radiation X-ray flux stimulates the oxygen ordering kinetics. The photoinduced ordering process shows a threshold characteristic of cooperative phenomena and its kinetics shows a temperature dependence that is controlled by the activation energy E A = 100 meV. |
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