Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi
We report on the structural and microscopic superconducting properties of the Ca_{1−x}Sr_{x}AlSi solid solution. Specifically, we have realized the continuous solid solution, which for all members, other than x=0 (CaAlSi), crystallizes in the AlB_{2}-type structure. For CaAlSi, we present an improve...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.033192 |
| _version_ | 1797210916202217472 |
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| author | Dorota I. Walicka Zurab Guguchia Jorge Lago Olivier Blacque KeYuan Ma Huanlong Liu Rustem Khasanov Fabian O. von Rohr |
| author_facet | Dorota I. Walicka Zurab Guguchia Jorge Lago Olivier Blacque KeYuan Ma Huanlong Liu Rustem Khasanov Fabian O. von Rohr |
| author_sort | Dorota I. Walicka |
| collection | DOAJ |
| description | We report on the structural and microscopic superconducting properties of the Ca_{1−x}Sr_{x}AlSi solid solution. Specifically, we have realized the continuous solid solution, which for all members, other than x=0 (CaAlSi), crystallizes in the AlB_{2}-type structure. For CaAlSi, we present an improved structural model where all Al/Si layers are buckled, leading to a 6-folded structure along the crystallographic c direction. We, furthermore, find indications for the structural instability in the parent compound CaAlSi to enhance the superconductivity across the solid solution. Our investigation of the magnetic penetration depths by means of muon-spin rotation experiments reveals that CaAlSi is a two-gap superconductor, that SrAlSi is a single-gap superconductor, and that there is a continuous transition from one electronic state to the other across the solid solution. Hence, we show that the Ca_{1−x}Sr_{x}AlSi solid solution is a highly tunable two-gap to single-gap superconducting system on a honeycomb lattice, where the superconductivity is strongly connected to a structural instability, i.e., the buckling of the Al/Si layers. |
| first_indexed | 2024-04-24T10:18:11Z |
| format | Article |
| id | doaj.art-35819b8faf474bb6b43288634b1bbb52 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:18:11Z |
| publishDate | 2021-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-35819b8faf474bb6b43288634b1bbb522024-04-12T17:13:21ZengAmerican Physical SocietyPhysical Review Research2643-15642021-08-013303319210.1103/PhysRevResearch.3.033192Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSiDorota I. WalickaZurab GuguchiaJorge LagoOlivier BlacqueKeYuan MaHuanlong LiuRustem KhasanovFabian O. von RohrWe report on the structural and microscopic superconducting properties of the Ca_{1−x}Sr_{x}AlSi solid solution. Specifically, we have realized the continuous solid solution, which for all members, other than x=0 (CaAlSi), crystallizes in the AlB_{2}-type structure. For CaAlSi, we present an improved structural model where all Al/Si layers are buckled, leading to a 6-folded structure along the crystallographic c direction. We, furthermore, find indications for the structural instability in the parent compound CaAlSi to enhance the superconductivity across the solid solution. Our investigation of the magnetic penetration depths by means of muon-spin rotation experiments reveals that CaAlSi is a two-gap superconductor, that SrAlSi is a single-gap superconductor, and that there is a continuous transition from one electronic state to the other across the solid solution. Hence, we show that the Ca_{1−x}Sr_{x}AlSi solid solution is a highly tunable two-gap to single-gap superconducting system on a honeycomb lattice, where the superconductivity is strongly connected to a structural instability, i.e., the buckling of the Al/Si layers.http://doi.org/10.1103/PhysRevResearch.3.033192 |
| spellingShingle | Dorota I. Walicka Zurab Guguchia Jorge Lago Olivier Blacque KeYuan Ma Huanlong Liu Rustem Khasanov Fabian O. von Rohr Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi Physical Review Research |
| title | Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi |
| title_full | Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi |
| title_fullStr | Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi |
| title_full_unstemmed | Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi |
| title_short | Two-gap to single-gap superconducting transition on a honeycomb lattice in Ca_{1−x}Sr_{x}AlSi |
| title_sort | two gap to single gap superconducting transition on a honeycomb lattice in ca 1 x sr x alsi |
| url | http://doi.org/10.1103/PhysRevResearch.3.033192 |
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