Oscillatory superconducting transition temperature in YBa2Cu4O8/La2/3Ca1/3MnO3/YBa2Cu4O8 heterostructures

YBa2Cu4O8/La2/3Ca1/3MnO3/YBa2Cu4O8 (Y-124/LCMO/Y-124) heterostructures were prepared by facing-target sputtering technique. The oscillatory behavior of superconducting transition temperature (TC) with the thickness of LCMO (dL) has been observed. The strongest nonmonotonic information in TC-dL curve...

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Veröffentlicht in:	Physica. C, Superconductivity Superconductivity, 2005-02, Vol.418 (3-4), p.138-143
Hauptverfasser:	KUN ZHAO, HUANG, Y. H, FENG, J. F, LI ZHANG, WONG, H. K
Format:	Artikel
Sprache:	eng
Schlagworte:	Colossal magnetoresistance Condensed matter: electronic structure, electrical, magnetic, and optical properties Cuprates superconductors (high tc and insulating parent compounds) Exact sciences and technology Magnetic properties and materials Magnetotransport phenomena, materials for magnetotransport Physics Superconductivity
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Zusammenfassung:	YBa2Cu4O8/La2/3Ca1/3MnO3/YBa2Cu4O8 (Y-124/LCMO/Y-124) heterostructures were prepared by facing-target sputtering technique. The oscillatory behavior of superconducting transition temperature (TC) with the thickness of LCMO (dL) has been observed. The strongest nonmonotonic information in TC-dL curves appears clearly when dL is larger than the critical thickness . The metal-insulator transition temperature (TMI) can only be detected at dL > . For LCMO/Y-124/LCMO trilayer films, the TMI has also shown an oscillation with decreasing spacer layer thickness. These kinds of symmetric dependence on the spacer layer in LCMO/Y-124 systems suggest strongly the interplay of ferromagnetic and superconducting couplings.
ISSN:	0921-4534 1873-2143
DOI:	10.1016/j.physc.2004.11.019