Nonsymmorphic symmetry protected hourglass Dirac chain topology and conventional superconductivity in ZrIrGe
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911190925443072 |
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| author | Meena, Pavan Kumar Samanta, Dibyendu Srivastava, Shashank Manna, Poulami Ghosh, Sudeep Kumar Singh, Ravi Prakash |
| author_facet | Meena, Pavan Kumar Samanta, Dibyendu Srivastava, Shashank Manna, Poulami Ghosh, Sudeep Kumar Singh, Ravi Prakash |
| contents | Ternary transition-metal germanide superconductors with nonsymmorphic symmetries offer promising platforms for symmetry-protected topological phases. In this work, we investigate ZrIrGe, which crystallizes in the nonsymmorphic TiNiSi-type structure. Electrical, magnetic, and specific heat measurements confirm bulk type-II superconductivity with a full gap and a transition temperature of 2.84(7) K, consistent with weak-coupling BCS behavior. First-principles calculations reveal hourglass-shaped bulk band dispersions and a Dirac chain composed of symmetry-protected fourfold-degenerate Dirac points, leading to drumhead-like surface states near the Fermi level. Additionally, ZrIrGe exhibits a nontrivial $\mathbb{Z}_2$ topological character, resulting in helical surface states that cross the Fermi level, making it a strong candidate for proximity-induced topological superconductivity. The coexistence of conventional superconductivity and topological band features establishes ZrIrGe as a rare stoichiometric system for exploring intrinsic topological superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_03188 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonsymmorphic symmetry protected hourglass Dirac chain topology and conventional superconductivity in ZrIrGe Meena, Pavan Kumar Samanta, Dibyendu Srivastava, Shashank Manna, Poulami Ghosh, Sudeep Kumar Singh, Ravi Prakash Superconductivity Ternary transition-metal germanide superconductors with nonsymmorphic symmetries offer promising platforms for symmetry-protected topological phases. In this work, we investigate ZrIrGe, which crystallizes in the nonsymmorphic TiNiSi-type structure. Electrical, magnetic, and specific heat measurements confirm bulk type-II superconductivity with a full gap and a transition temperature of 2.84(7) K, consistent with weak-coupling BCS behavior. First-principles calculations reveal hourglass-shaped bulk band dispersions and a Dirac chain composed of symmetry-protected fourfold-degenerate Dirac points, leading to drumhead-like surface states near the Fermi level. Additionally, ZrIrGe exhibits a nontrivial $\mathbb{Z}_2$ topological character, resulting in helical surface states that cross the Fermi level, making it a strong candidate for proximity-induced topological superconductivity. The coexistence of conventional superconductivity and topological band features establishes ZrIrGe as a rare stoichiometric system for exploring intrinsic topological superconductivity. |
| title | Nonsymmorphic symmetry protected hourglass Dirac chain topology and conventional superconductivity in ZrIrGe |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2510.03188 |