Magnetic Penetration Depth and Coherence Length in a Single‐Crystal YBa2Cu3O7−δ

Herein, DC magnetization measurements of high‐quality single crystals of optimally doped YBa2Cu3O7−δ(YBCO) superconductor are reported on. The temperature and orientation dependence of the magnetic penetration depth λ(T,θ) for single‐crystal YBCO is estimated from the slope of the linear M(lnH) depe...

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Bibliographic Details
Published in:physica status solidi (b) 2021-11, Vol.258 (11), p.n/a
Main Authors: Abou El Hassan, Ahmed, Labrag, Abdelaziz, Taoufik, Ahmed, Bghour, Mustapha, El Ouaddi, Hassan, Tirbiyine, Ahmed, Lmouden, Brahim, Hafid, Abdelhalim, El Hamidi, Habiba
Format: Article
Language:English
Subjects:
coherence length
critical field
magnetization
magnetoresistivity
penetration depth
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Summary:Herein, DC magnetization measurements of high‐quality single crystals of optimally doped YBa2Cu3O7−δ(YBCO) superconductor are reported on. The temperature and orientation dependence of the magnetic penetration depth λ(T,θ) for single‐crystal YBCO is estimated from the slope of the linear M(lnH) dependence in the London regime. The penetration depth is strongly anisotropic. Also, the electrical resistivity as a function of temperature in YBCO thin film deposited by laser ablation on the SrTiO3 substrate face is investigated around the superconducting transition region under various values of the magnetic field up to 14 T. In this work, based on the resistivity measurements, the upper critical magnetic field for both directions B∥c‐axis and B⊥c‐axis is determined with a DC weak transport current density by using 90% criteria of the normal‐state resistivity value. According to the relations Bc2∥c=ϕ02πξ∥2 and Bc2⊥c=ϕ02πξ∥ξ⊥, the coherence length ξ∥(0) and ξ⊥(0) is determined, where ϕ0 is the magnetic flux quantum. The anisotropy parameter is calculated and analyzed within the frame of Ginzburg–Landau theory. This result indicates that anisotropy is more evident in YBCO. The magnetization of YBa2Cu3O7−δ is studied to determine the temperature and orientation dependence of its magnetic penetration depth. It is concluded that the orientation dependence is strongly anisotropic. Furthermore, the coherence length [ξ∥(0) and ξ⊥(0)] is determined. It noted that the coherence length is larger along the ab‐plane, which confirms that superconductivity is established in the ab‐plane.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.202100292