The structural and superconducting properties in the YBa2Cu3O7-delta/BiFeO3 heterostructures
- Yang, Qianqian
- Ma, Xiaobai
- Dai, Qian
- Zhang, Huai
- Nie, Ruijuan
- Wang, Furen
DOIAbstract
Using pulsed laser deposition, the (001)-oriented YBa2Cu3O7-delta (YBCO) films were epitaxially grown on BiFeO3 (BFO) films on SrTiO3 substrates. The YBCO/BFO heterostructure retained the ferroelectricity of BFO layer and the superconductivity of the YBCO layer. A ferroelectric hysteresis loop was observed in the BFO layer and the remnant polarization was approximately 4.6 mu C/cm(2). The fabrication of YBCO layer resulted in a c-axis decrease of BFO layer, which affected its ferroelectric properties. Especially, as increasing the thickness of BFO film, the superconducting transition width of YBCO film increased. And the c-axis of YBCO film tended towards stability at 11.7 angstrom which ensured that all the samples were superconductive. Th...
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