|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P18: Microstructure and Superconductivity in Equiatomic Hf-Nb-Ta-Ti-V High Entropy Alloy
||Nilabja Kanti Sarkar, Raghvendra Tewari
|On-Site Speaker (Planned)
||Nilabja Kanti Sarkar
High entropy alloys (HEA) due to highly distorted lattice are expected to show unusual superconducting behaviour.We report synthesis, microstructural and superconducting properties characterization of a novel equiatomic high-entropy alloy with nominal composition of Hf20Nb20Ta20Ti20V20.Detailed microstructural characterization of the alloy showed dendritic morphology with preferential segregation tendency of Hf, Ti and V in inter-dendritic regions.XRD analysis revealed the presence of single bcc pattern indicating both the phases are having the same bcc phase. However TEM investigation indicates the presence of small amount of omega like secondary phase in HEA matrix.Transport properties and magnetization measurements established that the HEA is a type-II superconductor with a Tc of 5.5K, lower critical field (Hc1) of 20.0±8 mT and upper critical field (Hc2) of 6.63±0.05 T.Analysis of low temperature specific heat data suggests that the HEA is a moderately coupled superconductor which can be well described with the single-gap BCS model.