Low field irreversible response in the granular S.C. La1.8Sr0.2CuO4
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Low field low frequency a.c. susceptibility measurements show that the response is strongly non linear, the shielding current growingsublinearly with the increase of the applied field, andirreversible down to 50 μG. A new model of diamagnetic response is proposed, based on the idea of a fractal organization of the free energy landscape in the granular network.
KeywordsFractal Organization Free Energy Landscape Static Irreversibility Small Penetration Diamagnetic Response
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