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Superconducting properties of the C15-type Laves phase ZrIr2 with an Ir-based kagome lattice |
| Qing-Song Yang(杨清松)1,2, Bin-Bin Ruan(阮彬彬)1,†, Meng-Hu Zhou(周孟虎)1, Ya-Dong Gu(谷亚东)1,2, Ming-Wei Ma(马明伟)1, Gen-Fu Chen(陈根富)1,2, and Zhi-An Ren(任治安)1,2,‡ |
1 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract We report systematic studies on superconducting properties of the Laves phase superconductor ZrIr$_2$. It crystallizes in a C15-type (cubic MgCu$_2$-type, space group $Fd\overline{3}m$) structure in which the Ir atoms form a kagome lattice, with cell parameters $a=b=c=7.3596(1)$ Å. Resistivity and magnetic susceptibility measurements indicate that ZrIr$_2$ is a type-II superconductor with a transition temperature of 4.0 K. The estimated lower and upper critical fields are 12.8 mT and 4.78 T, respectively. Heat capacity measurements confirm the bulk superconductivity in ZrIr$_2$. ZrIr$_2$ is found to possibly host strong-coupled s-wave superconductivity with the normalized specific heat change $\Delta C_{\rm e}/\gamma T_{\rm c} \sim 1.86$ and the coupling strength $\Delta_0/k_{\rm B}T_{\rm c} \sim 1.92$. First-principles calculations suggest that ZrIr$_2$ has three-dimensional Fermi surfaces with simple topologies, and the states at Fermi level mainly originate from the Ir-5d and Zr-4d orbitals. Similar to SrIr$_2$ and ThIr$_2$, spin--orbit coupling has dramatic influences on the band structure in ZrIr$_2$.
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Received: 28 September 2022
Revised: 02 November 2022
Accepted manuscript online: 17 November 2022
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PACS:
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74.25.-q
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(Properties of superconductors)
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74.20.Pq
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(Electronic structure calculations)
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74.25.Bt
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(Thermodynamic properties)
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71.20.Lp
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(Intermetallic compounds)
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| Fund: Project supported by the National Key Research and Development of China (Grant Nos. 2018YFA0704200 and 2021YFA1401800), the National Natural Science Foundation of China (Grant Nos. 12074414 and 11774402), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000). |
Corresponding Authors:
Bin-Bin Ruan, Zhi-An Ren
E-mail: bbruan@mail.ustc.edu.cn;renzhian@iphy.ac.cn
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Cite this article:
Qing-Song Yang(杨清松), Bin-Bin Ruan(阮彬彬), Meng-Hu Zhou(周孟虎), Ya-Dong Gu(谷亚东), Ming-Wei Ma(马明伟), Gen-Fu Chen(陈根富), and Zhi-An Ren(任治安) Superconducting properties of the C15-type Laves phase ZrIr2 with an Ir-based kagome lattice 2023 Chin. Phys. B 32 017402
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