1. Bulk Superconductivity Below 6 K in PdBi2Te3 Topological Single Crystal.
- Author
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Sharma, M. M., Sang, Lina, Rani, Poonam, Wang, X. L., and Awana, V. P. S.
- Subjects
SINGLE crystals ,ENERGY dispersive X-ray spectroscopy ,SUPERCONDUCTIVITY ,FLUX pinning ,MAGNETIZATION measurement ,SCANNING electron microscopy - Abstract
We study the structural and bulk superconducting properties of self-flux grown PdBi
2 Te3 single crystal. Phase purity of as grown crystal is confirmed by Rietveld refinement of gently crushed powder XRD of the same. PdBi2 Te3 crystallizes in rhombohedral structure with R-3 m space group along with small impurity of Bi. Scanning electron microscopy (SEM) images showed layered structure and the elemental analysis by energy dispersive X-ray analysis (EDAX) done on same confirmed the stoichiometry to be near to PdBi2 Te3 . Characteristic vibrational modes, viz., A1 1g , Eg2 , and A2 1g , are clearly observed in Raman spectrum and are slightly shifted from that as in case of Bi2 Te3 . Bulk superconductivity is confirmed by FC and ZFC magnetization measurements (M-T) exhibiting diamagnetic transition with Tc onset at around 6 K. M-H plots at different temperatures of 2 K, 2.5 K, 3 K, 3.5 K, 4 K, 4.5 K, 5 K, and 6 K showed clear opening of the loop right up to 6 K. Both M-T and M-H clearly establish the appearance of bulk type II superconductivity below 6 K in studied PdBi2 Te3 . The lower critical field Hc1 and upper critical field Hc2 are at 180 Oe at 4800 Oe, respectively, at 2 K for as grown PdBi2 Te3 crystal. Other critical parameters of superconductivity such as coherence length, penetration depth and kappa parameter are also calculated. [ABSTRACT FROM AUTHOR]- Published
- 2020
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