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arXiv · 1912.11133

Change of electronic properties on transition from high-entropy to Ni-rich (TiZrNbCu)(1-x)Ni(x) alloys

Marko Kuveždić·Emil Tafra·Mario Basletić·Ramir Ristić·Petar Pervan·Vesna Mikšić Trontl·Ignacio A Figueroa·Emil Babić
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Abstract

We present results of comprehensive study of electronic properties of (TiZrNbCu)(1-x)Ni(x) metallic glasses performed in broad composition range x encompassing both, high entropy (HE) range, and conventional Ni-base alloy concentration range, x >= 0.35. The electronic structure studied by photoemission spectroscopy and low temperature specific heat (LTSH) reveal a split-band structure of density of states inside valence band with d-electrons of Ti, Zr, Nb and also Ni present at Fermi level N(E_F), whereas LTSH and magnetoresistivity results show that variation of N(E_F) with x changes in Ni-base regime. The variation of superconducting transition temperatures with x closely follows that of N(E_F). The electrical resistivities of all alloys are high and decrease with increasing temperature over most of explored temperature range, and their temperature dependence seems dominated by weak localization effects over a broad temperature range (10-300 K). The preliminary study of Hall effect shows positive Hall coefficient that decreases rapidly in Ni-base alloys.

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Marko Kuveždić, Emil Tafra, Mario Basletić, Ramir Ristić, Petar Pervan, Vesna Mikšić Trontl, Ignacio A Figueroa, Emil Babić. 2019-12-23. Change of electronic properties on transition from high-entropy to Ni-rich (TiZrNbCu)(1-x)Ni(x) alloys. https://doi.org/10.1016/j.jnoncrysol.2019.119865

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