Superconductivity in Hexagonal Zr6CoAl2-Type Zr6RuBi2 and Zr6FeBi2
Kosuke Yuchi, Daisuke Nishio-Hamane, Keita Kojima, Kodai Moriyama,, Ryutaro Okuma, and Yoshihiko Okamoto
TL;DR
This paper reports the discovery of bulk superconductivity in polycrystalline Zr6RuBi2 and Zr6FeBi2 with transition temperatures of 4.9 K and 1.4 K, respectively, highlighting their structural and electronic properties.
Contribution
It introduces new superconducting materials Zr6RuBi2 and Zr6FeBi2 with detailed synthesis and characterization, expanding the understanding of Zr6CoAl2-type superconductors.
Findings
Zr6RuBi2 is a bulk superconductor below 4.9 K.
Zr6FeBi2 is a bulk superconductor below 1.4 K.
Higher Tc in Zr6RuBi2 compared to Zr6FeBi2 is notable.
Abstract
We report the synthesis and electronic properties of polycrystalline samples of Zr6MBi2 (M = Ru and Fe) crystallizing in the hexagonal Zr6CoAl2-type structure. Based on their electrical resistivity, magnetization, and heat capacity data, Zr6RuBi2 and Zr6FeBi2 are found to exhibit bulk superconductivity below Tc = 4.9 and 1.4 K, respectively. Although Zr6RuBi2 is most likely a conventional superconductor, the considerably higher Tc for M = Ru than that for M = Fe differs from the trend in Tc for Zr6CoAl2-type superconductors reported thus far. The superconductivity of an amorphous solid-solution phase, which may hinder elucidation of the superconducting properties of Zr6MBi2, is also discussed.
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Taxonomy
TopicsRare-earth and actinide compounds · Boron and Carbon Nanomaterials Research · MXene and MAX Phase Materials