Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
The study involves four different compounds ofT1Sr1212 superconductors. There are T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.6), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), T10.5Pb0.5Sr2-xMgx Ca0.8Yb0.2Cu2O7-δ (x=0-1.0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x = 0.1-0.4) series. All the samples were synthesized usin...
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| Format: | Thesis |
| Language: | English |
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2010
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| Online Access: | https://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf |
| _version_ | 1825736622513061888 |
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| author | Ahmad, Nurulhuda |
| author_facet | Ahmad, Nurulhuda |
| author_sort | Ahmad, Nurulhuda |
| collection | UITM |
| description | The study involves four different compounds ofT1Sr1212 superconductors. There are T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.6), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), T10.5Pb0.5Sr2-xMgx Ca0.8Yb0.2Cu2O7-δ (x=0-1.0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x = 0.1-0.4) series. All the samples were synthesized using the solid state synthesis method. Temperature dependent electrical resistance measurements on T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x = 0.006) series showed the best superconducting behavior at x=O.4 with zero resistance critical temperature (TC zero) of 77.6 K. On the other hand, electrical resistance measurements on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) series showed gradual decrease in TC zero followed by a sudden increase in TC at x = 0.3. Further substitution of Cu at x≥0.4 however caused TC to be suppressed. Electrical resistance measurement in T10.5Pb0.5Sr2-xMgxCa0.8Yb 0.2Cu2O7-δ (x=0-1.0) showed increasing semiconductor-like normal state behavior and gradual suppression of Tc with Mg. In addition, superconducting fluctuation behavior (SFB) in T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.4), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3), T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x= 0.1-0.4) ceramics were analyzed by using Asmalazov-Larkin (AL) theory as a framework. In T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0-0.4), the analysis showed characteristic cross-over from 2D to 3D behavior with decreasing temperature. Cu substitutions in this series is suggested to give effect on c-axis coherence length, ξC(0) and hole concentration of carrier. For T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3) ceramics revealed 2D to 3D transition and showed Cu substitution affects the AL3D constant and increases c-axis coherence length, ξC(0) . Excess conductivity of T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ ceramics (x=0.0) showed exclusively 1D to 2D transition behavior. In addition, superconducting fluctuation behavior in sintered polycrystalline samples of T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x=0.1-0.4) revealed transition from 2-D to 3-D behavior. This study also suggests that there is a close correlation between the amounts of Yb substitution and the behavior of AL constant (A). Fourier Transform Infrared (FTIR) spectroscopy analyses was performed on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) and T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) samples. In T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), the results showed CuO2 planar oxygen mode observed was softened with increased Cu substitution indicating enhanced coupling between CuO2 planes. FTIR absorption data for T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) indicate possible tilt of oxygen atoms in the CuO2 plane as a result of unequal bond lengths and enhanced CuO2 inter-plane coupling. |
| first_indexed | 2024-03-06T02:05:33Z |
| format | Thesis |
| id | uitm.eprints-7305 |
| institution | Universiti Teknologi MARA |
| language | English |
| last_indexed | 2024-03-06T02:05:33Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | uitm.eprints-73052022-06-14T02:16:17Z https://ir.uitm.edu.my/id/eprint/27305/ Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad Ahmad, Nurulhuda Ceramic technology. Pottery The study involves four different compounds ofT1Sr1212 superconductors. There are T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.6), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), T10.5Pb0.5Sr2-xMgx Ca0.8Yb0.2Cu2O7-δ (x=0-1.0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x = 0.1-0.4) series. All the samples were synthesized using the solid state synthesis method. Temperature dependent electrical resistance measurements on T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x = 0.006) series showed the best superconducting behavior at x=O.4 with zero resistance critical temperature (TC zero) of 77.6 K. On the other hand, electrical resistance measurements on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) series showed gradual decrease in TC zero followed by a sudden increase in TC at x = 0.3. Further substitution of Cu at x≥0.4 however caused TC to be suppressed. Electrical resistance measurement in T10.5Pb0.5Sr2-xMgxCa0.8Yb 0.2Cu2O7-δ (x=0-1.0) showed increasing semiconductor-like normal state behavior and gradual suppression of Tc with Mg. In addition, superconducting fluctuation behavior (SFB) in T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.4), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3), T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x= 0.1-0.4) ceramics were analyzed by using Asmalazov-Larkin (AL) theory as a framework. In T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0-0.4), the analysis showed characteristic cross-over from 2D to 3D behavior with decreasing temperature. Cu substitutions in this series is suggested to give effect on c-axis coherence length, ξC(0) and hole concentration of carrier. For T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3) ceramics revealed 2D to 3D transition and showed Cu substitution affects the AL3D constant and increases c-axis coherence length, ξC(0) . Excess conductivity of T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ ceramics (x=0.0) showed exclusively 1D to 2D transition behavior. In addition, superconducting fluctuation behavior in sintered polycrystalline samples of T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x=0.1-0.4) revealed transition from 2-D to 3-D behavior. This study also suggests that there is a close correlation between the amounts of Yb substitution and the behavior of AL constant (A). Fourier Transform Infrared (FTIR) spectroscopy analyses was performed on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) and T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) samples. In T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), the results showed CuO2 planar oxygen mode observed was softened with increased Cu substitution indicating enhanced coupling between CuO2 planes. FTIR absorption data for T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) indicate possible tilt of oxygen atoms in the CuO2 plane as a result of unequal bond lengths and enhanced CuO2 inter-plane coupling. 2010 Thesis NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad. (2010) Masters thesis, thesis, Universiti Teknologi MARA. <http://terminalib.uitm.edu.my/27305.pdf> |
| spellingShingle | Ceramic technology. Pottery Ahmad, Nurulhuda Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad |
| title | Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad |
| title_full | Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad |
| title_fullStr | Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad |
| title_full_unstemmed | Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad |
| title_short | Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad |
| title_sort | effects of ti and sr site substitutions on superconductivity structure and excess conductivity of tisr2cacu2o7 δ ceramics nurulhuda ahmad |
| topic | Ceramic technology. Pottery |
| url | https://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf |
| work_keys_str_mv | AT ahmadnurulhuda effectsoftiandsrsitesubstitutionsonsuperconductivitystructureandexcessconductivityoftisr2cacu2o7dceramicsnurulhudaahmad |