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Khan MR, Leo A, Nigro A, Galluzzi A, Polichetti M, Braccini V, Cialone M, Scuderi M, Grimaldi G. Effective Magnetic Field Dependence of the Flux Pinning Energy in FeSe 0.5Te 0.5 Superconductor. MATERIALS (BASEL, SWITZERLAND) 2021; 14:5289. [PMID: 34576513 PMCID: PMC8471004 DOI: 10.3390/ma14185289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/31/2021] [Accepted: 09/08/2021] [Indexed: 11/16/2022]
Abstract
The role of a layered structure in superconducting pinning properties is still at a debate. The effects of the vortex shape, which can assume for example a staircase form, could influence the interplay with extrinsic pinning coming from the specific defects of the material, thus inducing an effective magnetic field dependence. To enlighten this role, we analysed the angular dependence of flux pinning energy U(H,θ) as a function of magnetic field in FeSe0.5Te0.5 thin film by considering the field components along the ab-plane of the crystal structure and the c-axis direction. U(H,θ) has been evaluated from magneto-resistivity measurements acquired at different orientations between the applied field up to 16 T and FeSe0.5Te0.5 thin films grown on a CaF2 substrate. We observed that the U(H,θ) shows an anisotropic trend as a function of both the intensity and the direction of the applied field. Such a behaviour can be correlated to the presence of extended defects elongated in the ab-planes, thus mimicking a layered superconductor, as we observed in the microstructure of the compound. The comparison of FeSe0.5Te0.5 with other superconducting materials provides a more general understanding on the flux pinning energy in layered superconductors.
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Affiliation(s)
- Masood Rauf Khan
- Physics Department “E. R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy; (M.R.K.); (A.N.); (A.G.); (M.P.)
| | - Antonio Leo
- Physics Department “E. R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy; (M.R.K.); (A.N.); (A.G.); (M.P.)
- CNR SPIN Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy;
| | - Angela Nigro
- Physics Department “E. R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy; (M.R.K.); (A.N.); (A.G.); (M.P.)
- CNR SPIN Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy;
| | - Armando Galluzzi
- Physics Department “E. R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy; (M.R.K.); (A.N.); (A.G.); (M.P.)
- CNR SPIN Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy;
| | - Massimiliano Polichetti
- Physics Department “E. R. Caianiello”, University of Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy; (M.R.K.); (A.N.); (A.G.); (M.P.)
- CNR SPIN Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy;
| | - Valeria Braccini
- CNR SPIN Genova, c.so F. M. Perrone 24, I-16152 Genova, Italy; (V.B.); (M.C.)
| | - Matteo Cialone
- CNR SPIN Genova, c.so F. M. Perrone 24, I-16152 Genova, Italy; (V.B.); (M.C.)
| | - Mario Scuderi
- CNR IMM Catania Headquarter, Strada VIII n.5 Zona Industriale, I-95121 Catania, Italy;
| | - Gaia Grimaldi
- CNR SPIN Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy;
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