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AC susceptibility and electrical properties of Cr and Mo substituted Tl(BaSr)CaCu2O7 Tl-1212 type phase superconductors

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Abstract

The Ba and Sr bearing Tl(BaSr)CaCu2O7 (Tl-1212) phase is an interesting superconductor. Optimizing the average copper valence can lead to a high transition temperature, Tc. Single elemental substitution can be used to optimize the Cu valence. This work investigated the effects of multivalent Cr and Mo substitutions at the Tl site of Tl1-xMx(BaSr)CaCu2O7 (M = Cr and Mo). The samples were prepared via the solid-state reaction method. The structure and lattice parameters were determined using the X-ray diffraction method (XRD). A field emission scanning electron microscope (FESEM) was utilized to observe the microstructure. The electrical resistance and AC susceptibility were measured to determine the transition temperature. XRD pattern showed a single Tl(BaSr)CaCu2O7 phase for the non-substituted sample. Other phases, such as Tl-1201 and Ca0.3Sr0.7CuO2 were also observed in the Cr and Mo substituted samples. The non-substituted sample showed onset transition temperature, Tc-onset of 108 K. The highest Tc-onset was observed in the Tl0.9Mo0.1(BaSr)CaCu2O7 (115 K) and Tl0.5Cr0.5(BaSr)CaCu2O7 (111 K) samples. The intergranular critical current density was between 17 and 22 A cm−2. Cr substitutions for x = 0.1 to 0.5 and Mo substitutions for x = 0.1 showed the highest transition temperature. These results can be used as guides to improve the superconducting properties of the Tl-1212 phase.

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Acknowledgements

The Ministry of Higher Education (MOHE), Malaysia, supported this research under grant no. FRGS/1/2020/STG07/UKM/01/1.

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Authors and Affiliations

  1. Department of Applied Physics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

    K. Muhammad-Najib, K. Muhammad-Aizat, M. H. Jumali & R. Abd-Shukor

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  3. M. H. Jumali
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Contributions

Conceptualization: RAS; methodology: KMN, KMA and MHJ; formal analysis and investigation: KMN and MHJ; writing—original draft preparation: KMN; writing—review and editing: RAS; funding acquisition: RAS; resources: RAS.

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Correspondence to R. Abd-Shukor.

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Muhammad-Najib, K., Muhammad-Aizat, K., Jumali, M.H. et al. AC susceptibility and electrical properties of Cr and Mo substituted Tl(BaSr)CaCu2O7 Tl-1212 type phase superconductors. Appl. Phys. A 129, 634 (2023). https://doi.org/10.1007/s00339-023-06911-8

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