Structural, electro-magnetic, and optical properties of Ba(Fe, Ni)2As2 single-crystal thin film. (29th December 2016)

• Record Type: Journal Article
• Authors: Yoon, Sejun; Seo, Yu-Seong; Lee, Seokbae; Weiss, Jeremy D; Jiang, Jianyi; Oh, MyeongJun; Lee, Jongmin; Seo, Sehun; Jo, Youn Jung; Hellstrom, Eric E; Hwang, Jungseek; Lee, Sanghan
• Is Part Of: Superconductor science & technology. Volume 30:Number 3(2017:Mar.)
• Publication Date: 2016-12-29
• Subjects: epitaxial thin films -- Ba(Fe -- Ni)2As2 -- optical spectroscopy -- pnictides; 74.70.Xa -- 74.78.-w -- 74.25.-q -- 74.25.Gz; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/30/3/035001
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We investigated the superconducting transition temperature ( T c ), critical current density ( J c ) and optical properties of optimally doped Ba(Fe0.95 Ni0.05 )2 As2 (Ni-Ba122) single-crystalline epitaxial thin films grown by pulsed laser deposition for the first time. The T c at zero resistivity was about 20.5 K and the J c at self-field and 4.2 K was 2.8 MA cm −2 calculated by the Bean model. The superconducting properties such as T c and J c of thin films are comparable to those of bulk single-crystal samples. The superfluid plasma frequency ( λ p, S ) of Ni-Ba122 thin film is ∼7033 cm −1 obtained by optical spectroscopic technique. Based on this plasma frequency, we obtained the London penetration depth ( λ L ), ∼226 nm at 8 K, which is comparable to those of optimally Co- and K-doped BaFe2 As2 single crystals.