Study of the Flux Pinning Landscape of YBCO Thin Films With Single and Mixed Phase Additions BaMO3 + Z: M = Hf, Sn, Zr and Z = Y2O3, Y211
| Autor: | Mary Ann Sebastian, Joshua N. Reichart, T. J. Bullard, Judy Z. Wu, Haiyan Wang, George Y. Panasyuk, Wenrui Zhang, Jijie Huang, Chen-Fong Tsai, Margaret M. Ratcliff, Jack L. Burke, Timothy J. Haugan, Charles R. Ebbing |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Materials science Flux pinning Condensed matter physics Doping 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials Pulsed laser deposition 0103 physical sciences Electrical and Electronic Engineering Thin film 010306 general physics 0210 nano-technology Anisotropy Current density |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 27:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2017.2652301 |
| Popis: | Addition of nanophase defects to YBa2Cu3O7 (YBCO) superconductor thin films enhances flux pinning, resulting in an increase in transport current densities (Jct). While previous studies focused on single-phase additions such as BaSnO 3 , BaZrO 3 , and Y 2 BaCuO 5 (Y211); the addition of several phases simultaneously has shown strong improvements by combining different flux pinning mechanisms. This paper further explores and compares the effect of mixed-phase nanoparticle pinning, with the addition of insulating, nonreactive phases of: 1) BaSnO 3 + Y 2 O 3 , 2) BaSnO 3 + Y211, 3) BaZrO 3 + Y 2 O 3 , and 4) BaHfO 3 + Y 2 O 3 . Processing parameters vary the doped YBCO single target volume percent of either BaHfO 3 , BaSnO 3 , or BaZrO 3 , while maintaining either Y 2 O 3 or Y211 constant at 3 vol.%. Pulsed laser deposition produces films on LaAlO 3 and SrTiO 3 substrates at deposition temperatures of 750-840 °C. Current density is measured for fields ranging from H = 0-9 T with H // c, and temperatures from 5 to 77 K, providing a detailed picture of pinning effects. Optimized results of flux pinning, magnetic current densities J cm (H, T), critical transition temperatures (T c ), lattice parameters, and microstructures are presented. The temperature dependence of the current density, J c (T), is mathematically modeled to compare the isotropic weak and anisotropic strong pinning contributions, for each of the mixed phase systems studied. |
| Databáze: | OpenAIRE |
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