Peculiar critical current density and irreversibility line in double perovskite Ba2SmNbO6-doped SmBa2Cu3Oy film prepared by Nd:YAG pulsed laser deposition. (12th June 2017)

• Record Type: Journal Article
• Authors: Ichino, Yusuke; Kusafuka, Yuma; Ichinose, Ataru; Yoshida, Yutaka
• Is Part Of: Japanese journal of applied physics. Volume 56:Number 7(2017)
• Publication Date: 2017-06-12
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.56.073101
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: We prepared SmBa2 Cu3 O y (SmBCO) films including Ba2 SmNbO6 (BSNO) by Nd:YAG pulsed laser deposition (PLD) on LaAlO3 single-crystalline substrates. The BSNO formed many nanorods with a large diameter of 35 nm, which is the largest nanorod diameter in REBa2 Cu3 O y films, and their in-plane distribution was random. The matching field estimated from the number density of 202 µm −2 was 0.42 T. We measured J c – B curves at various measurement temperatures and these J c – B curves had a J c peak at approximately 0.37 T. Interestingly, the irreversibility line showed a "reverse S" shape and an anomalous curve was observed at approximately 0.37 T near T c . To the best of our knowledge, this is the first time that these distinctive features were found in this sample. We concluded that these peculiar behaviors originated from the large-diameter, straight, and threading BSNO nanorods.