90K superconductivity of clean Pb1212 epitaxial films

作者：Komori S^*; Kondo A; Kindo K; Kakeya I

来源：Superconductor Science and Technology, 2016, 29(8): 085007.

DOI：10.1088/0953-2048/29/8/085007

• Pb1212
• ex situ growth
• anisotropy

A single-phase Pb1-ySr2Y1-xCaxCu2+yO7+delta (Pb1212) epitaxial film with T-c,T-onset = 90 K has been grown using a two-step technique, which allows lattice relaxation near the film/substrate interface and reduction of Pb vacancies. Using the upper critical field measurement, the coherence lengths are derived to be 20 and 4.3. angstrom, along the ab-plane and c-axis, respectively. The value of the irreversibility field is found to be close to that of YBa2Cu3O7. High magnetic field measurement has revealed normal state resistivity below T-c and metallic behavior in the underdoped region.

• 出版日期2016-8