Y(Dy0.5) Ba2Cu3O7-δ涂层导体的各向异性以及磁通钉扎研究

Anisotropy and Flux Pinning of Y(Dy0.5) Ba2Cu3O7-δCoated Conductors

  • 摘要: 我们对Y(Dy)Ba2Cu3O7-δ涂层导体的超导转变温度Tc、临界电流密度Jc、上临界磁场Hc2、不可逆场Hirr、热激活能U0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//cH//ab时均属于面钉扎类型。

     

    Abstract: We performed a systematic study of the superconducting transition temperature(Tc), critical current density(Jc), irreversibility field(Hirr), upper critical field(Hc2), activation energy(U0) and flux pinning mechanism in Y(Dy0.5) Ba2Cu3O7-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, α is 0.5 and 0.57 that indicate the surface pinning is responsible for the main pinning mechanism in Y(Dy0.5) Ba2Cu3O7-δ coated conductors.

     

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