Superconductivity in Ternary Germanite TaAl$_{x}$Ge$_{2-x}$ with a C40 chiral structure
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929600256278528 |
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| author | Koizumi, Daigo Kisanuki, Shingo Monden, Kenta Kousaka, Yusuke Shishido, Hiroaki Togawa, Yoshihiko |
| author_facet | Koizumi, Daigo Kisanuki, Shingo Monden, Kenta Kousaka, Yusuke Shishido, Hiroaki Togawa, Yoshihiko |
| contents | We report a new family of chiral intermetallic superconductors TaAl$_{x}$Ge$_{2-x}$. The mother compound TaGe$_2$ has a C40-type chiral hexagonal crystal structure with a pair of enantiomorphic space groups of $P6{_2}22$ and $P6{_4}22$. By substituting Ge with Al, TaAl$_{x}$Ge$_{2-x}$ polycrystals with the C40 structure were synthesized with Al substitution $x$ from 0 to 0.8. Magnetic susceptibility, magnetization curves and electrical resistivity revealed that TaAl$_{x}$Ge$_{2-x}$ with $x$ of 0.2 to 0.4 was a type-II superconductor with a superconducting transition temperature $T_{\rm c}$ of 2.0 to 2.2 K. The superconductivity disappeared or was largely suppressed at $x$ less than 0.2 and more than 0.4, although all the measurements were performed at temperatures above 1.8 K. An emergence of superconductivity is discussed in terms of the lattice constants changes with the Al substitution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_14549 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Superconductivity in Ternary Germanite TaAl$_{x}$Ge$_{2-x}$ with a C40 chiral structure Koizumi, Daigo Kisanuki, Shingo Monden, Kenta Kousaka, Yusuke Shishido, Hiroaki Togawa, Yoshihiko Superconductivity Materials Science We report a new family of chiral intermetallic superconductors TaAl$_{x}$Ge$_{2-x}$. The mother compound TaGe$_2$ has a C40-type chiral hexagonal crystal structure with a pair of enantiomorphic space groups of $P6{_2}22$ and $P6{_4}22$. By substituting Ge with Al, TaAl$_{x}$Ge$_{2-x}$ polycrystals with the C40 structure were synthesized with Al substitution $x$ from 0 to 0.8. Magnetic susceptibility, magnetization curves and electrical resistivity revealed that TaAl$_{x}$Ge$_{2-x}$ with $x$ of 0.2 to 0.4 was a type-II superconductor with a superconducting transition temperature $T_{\rm c}$ of 2.0 to 2.2 K. The superconductivity disappeared or was largely suppressed at $x$ less than 0.2 and more than 0.4, although all the measurements were performed at temperatures above 1.8 K. An emergence of superconductivity is discussed in terms of the lattice constants changes with the Al substitution. |
| title | Superconductivity in Ternary Germanite TaAl$_{x}$Ge$_{2-x}$ with a C40 chiral structure |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2411.14549 |