90 K superconductivity of clean Pb1212 epitaxial films. (16th June 2016)

• Record Type: Journal Article
• Authors: Komori, S; Kondo, A; Kindo, K; Kakeya, I
• Is Part Of: Superconductor science & technology. Volume 29:Number 8(2016:Aug.)
• Publication Date: 2016-06-16
• Subjects: Pb1212 -- ex situ growth -- anisotropy; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/29/8/085007
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: A single-phase Pb 1 − y Sr 2 Y 1 − x Ca x Cu 2 + y O 7 + δ (Pb1212) epitaxial film with T c, 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 Å, along the ab -plane and c -axis, respectively. The value of the irreversibility field is found to be close to that of YBa2 Cu3 O7 . High magnetic field measurement has revealed normal state resistivity below T c and metallic behavior in the underdoped region.