摘要
我们对Y(Dy)Ba_(2)Cu_(3)O_(7-δ)涂层导体的超导转变温度T_(c)、临界电流密度J_(c)、上临界磁场H_(c2)、不可逆场H_(irr)、热激活能U_(0)和磁通钉扎机理进行了系统的研究。结果显示当磁场垂直于(H//c)和平行于(H//ab)样品表面的方向,电阻率的展宽行为有明显的差别,说明电阻率具有很强的磁场诱导的面间各向异性。根据热激活的磁通运动理论,当外加磁场平行于样品表面(H//ab)时,钉扎相对于磁场垂直于样品表面(H//c)时要强,α值分别为0.5和0.57,说明涂层导体在H//c和H//ab时均属于面钉扎类型。
We performed a systematic study of the superconducting transition temperature(T_(c)),critical current density(J_(c)),irreversibility field(H_(irr)),upper critical field(H_(c2)),activation energy(U_(0))and flux pinning mechanism in Y(Dy0.5)Ba_(2)Cu_(3)O_(7-δ)coated conductors.Our results show that the broadening of the resistivity transition is significantly different when H//c and H//ab,indicating that resistivity has a strong magnetic field-induced inter-plane anisotropy.Based on the thermally activated flux flow(TAFF)model,the flux pinning of H//ab is stronger than that of H//c.In the case of H//ab and H//c,αis 0.5 and 0.57 that indicate the surface pinning is responsible for the main pinning mechanism in Y(Dy0.5)Ba_(2)Cu_(3)O_(7-δ)coated conductors.
作者
桑丽娜
李敏娟
张义邴
朱红妹
彭麟
李文献
蔡传兵
SANG Li-na;LI Min-juan;ZHANG Yi-bing;ZHU Hong-mei;PENG Lin;LI Wen-xian;CAI Chuan-bing(Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;Shanghai Key Laboratory of High Temperature Superconductors,Physics Department,Shanghai University,Shanghai 200444,China;College of Mathematics and Physics,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《功能材料与器件学报》
CAS
2021年第6期573-576,共4页
Journal of Functional Materials and Devices
基金
国家重点研发计划(No.2016YFF0101701)
中科院先导专项(No.XDB25000000)资助
国家自然科学基金面上项目(No.51572166)
关键词
涂层导体
磁通钉扎
超导转变温度
临界电流密度
Coated conductors
Flux pinning
Superconducting transition temperature(T_(c))
Critical current density(J_(c))
