Persistent photoconductivity in oxygen deficient YBCO/LCMO superlattices grown by PLD

G. Logvenov; H.-U. Habermeier; K. Kawashima; S. Soltan

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Persistent photoconductivity in oxygen deficient YBCO/LCMO superlattices grown by PLD

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arxiv 1309.1295 v1 pith:V3F6I7UH submitted 2013-09-05 cond-mat.str-el cond-mat.mtrl-sci

K. Kawashima , S. Soltan , G. Logvenov , H.-U. Habermeier This is my paper

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keywords oxygenphotoconductivitysuperlatticesdeltaeffectgrowninterfacelcmo

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We report a large persistent photoconductivity (PPC) in oxygen reduced PLD grown YBa2Cu3O7-{\delta}/La2/3Ca1/3MnO3-y (YBCO/LCMO) superlattices scaling with the oxygen deficiency and being similar to that observed in single layer YBa2Cu3O7-{\delta} films. These results contradict previous observations where in sputtered bilayer samples only a transient photoconductivity (TPC) was found. We argue that the PPC effect in superlattices is caused by the PPC effect due to the YBa2Cu3O7-x layers with limited charge transfer to La2/3Ca1/3MnO3-y. The discrepancy arises from the different permeability of charges across the interface and shed light on the sensitivity of oxide interface properties on details of their preparation.

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