Evaluation of temperature dependent vortex pinning properties in strongly pinned YBa_(2)Cu_(3)O_(7-δ)thin films with Y_(2)BaCuO_(5)nanoinclusions  

作　　者：Alok K.Jha Kaname Matsumoto Tomoya Horide Shrikant Saini Ataru Ichinose Paolo Mele Yutaka Yoshida Satoshi Awaji 

机构地区：[1]Department of Materials Science and Engineering,Kyushu Institute of Technology,Tobata-ku,Kitakyushu 804-8550,Japan [2]Department of Mechanical and Control Engineering,Kyushu Institute of Technology,Tobata-ku,Kitakyushu 804-8550,Japan [3]Central Research Institute of Electrical Power Industry,Yokosuka,Kanagawa 240-0196,Japan [4]College of Engineering-Innovative Global Program,Shibaura Institute of Technology,Minuma-ku,Saitama 337-8570,Japan [5]Department of Energy Engineering and Science,Nagoya University,Chikusa-ku,Nagoya 464-8603,Japan [6]Institute for Materials Research,Tohoku University,Aoba-ku,Sendai 980-8577,Japan

出　　处：《Superconductivity》2024年第1期95-105,共11页超导（英文）

基　　金：supported by the ALCA project of Japan Science and Technology Agency.

摘　　要：The pinning of quantized magnetic vortices in superconducting YBa_(2)Cu_(3)O_(7-δ)(YBCO or Y123)thin films with Y_(2)BaCuO_(5)(Y211)nanoinclusions have been investigated over wide temperature range(4.2-77 K).The concentration of Y211 nanoinclusions has been systematically varied inside YBCO thin films prepared by laser ablation technique using surface modified target approach.Large pinning force density values(Fp∼0.5 TNm^(−3)at 4.2 K,9 T)have been observed for the YBCO film with moderate concentration of Y211 nanoinclusions(3.6 area%on ablation target).In addition,uniform enhancement in critical current density(J_(c))was observed in the angular dependent J_(c)measurement of YBCO+Y211 nanocomposite films.Y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in‐field J_(c)values over a wide range of temperature.Increasing the concentration of Y211 secondary phase into Y123 film matrix results into agglomeration of Y211 phase and observed as increased Y211 nanoparticle size.These larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower temperatures.Investigation of the temperature dependence of J_(c)for YBCO+Y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.

关 键 词：YBCO thin film Critical current Vortex pinning Nanoscale APCs 

分 类 号：TB383[一般工业技术—材料科学与工程]