Microscopic probing of the superconducting and normal state properties of Ta2V3.1Si0.9 by muon spin rotation
(2024) In Communications Materials 5(1).- Abstract
The two-dimensional kagome lattice is an experimental playground for novel physical phenomena, from frustrated magnetism and topological matter to chiral charge order and unconventional superconductivity. A newly identified kagome superconductor, Ta2V3.1Si0.9 has recently gained attention for possessing a record high critical temperature, TC = 7.5 K for kagome metals at ambient pressure. In this study we conducted a series of muon spin rotation measurements to delve deeper into understanding the superconducting and normal state properties of Ta2V3.1Si0.9. We demonstrate that Ta2V3.1Si0.9 is a bulk superconductor with either a... (More)
The two-dimensional kagome lattice is an experimental playground for novel physical phenomena, from frustrated magnetism and topological matter to chiral charge order and unconventional superconductivity. A newly identified kagome superconductor, Ta2V3.1Si0.9 has recently gained attention for possessing a record high critical temperature, TC = 7.5 K for kagome metals at ambient pressure. In this study we conducted a series of muon spin rotation measurements to delve deeper into understanding the superconducting and normal state properties of Ta2V3.1Si0.9. We demonstrate that Ta2V3.1Si0.9 is a bulk superconductor with either a s+s-wave or anisotropic s-wave gap symmetry, and has an unusual paramagnetic shift in response to external magnetic fields in the superconducting state. Additionally, we observe an exceptionally low superfluid density − a distinctive characteristic of unconventional superconductivity − which remarkably is comparable to the superfluid density found in hole-doped cuprates. In its normal state, Ta2V3.1Si0.9 exhibits a significant increase in the zero-field muon spin depolarisation rate, starting at approximately 150 K, which has been observed in other kagome-lattice superconductors, and therefore hints at possible hidden magnetism. These findings characterise Ta2V3.1Si0.9 as an unconventional superconductor and a noteworthy new member of the vanadium-based kagome material family.
(Less)
- author
- Graham, J. N. LU ; Liu, H. ; Sazgari, V. ; Mielke, Charles ; Medarde, M. ; Luetkens, H. ; Khasanov, R. ; Shi, Y. and Guguchia, Z.
- publishing date
- 2024-12
- type
- Contribution to journal
- publication status
- published
- in
- Communications Materials
- volume
- 5
- issue
- 1
- article number
- 225
- publisher
- Springer Nature
- external identifiers
-
- scopus:85206384564
- ISSN
- 2662-4443
- DOI
- 10.1038/s43246-024-00666-2
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © The Author(s) 2024.
- id
- 3158ed68-7f06-4818-a666-6a7633984d64
- date added to LUP
- 2026-05-28 17:41:24
- date last changed
- 2026-06-02 08:24:38
@article{3158ed68-7f06-4818-a666-6a7633984d64,
abstract = {{<p>The two-dimensional kagome lattice is an experimental playground for novel physical phenomena, from frustrated magnetism and topological matter to chiral charge order and unconventional superconductivity. A newly identified kagome superconductor, Ta<sub>2</sub>V<sub>3.1</sub>Si<sub>0.9</sub> has recently gained attention for possessing a record high critical temperature, T<sub>C</sub> = 7.5 K for kagome metals at ambient pressure. In this study we conducted a series of muon spin rotation measurements to delve deeper into understanding the superconducting and normal state properties of Ta<sub>2</sub>V<sub>3.1</sub>Si<sub>0.9</sub>. We demonstrate that Ta<sub>2</sub>V<sub>3.1</sub>Si<sub>0.9</sub> is a bulk superconductor with either a s+s-wave or anisotropic s-wave gap symmetry, and has an unusual paramagnetic shift in response to external magnetic fields in the superconducting state. Additionally, we observe an exceptionally low superfluid density − a distinctive characteristic of unconventional superconductivity − which remarkably is comparable to the superfluid density found in hole-doped cuprates. In its normal state, Ta<sub>2</sub>V<sub>3.1</sub>Si<sub>0.9</sub> exhibits a significant increase in the zero-field muon spin depolarisation rate, starting at approximately 150 K, which has been observed in other kagome-lattice superconductors, and therefore hints at possible hidden magnetism. These findings characterise Ta<sub>2</sub>V<sub>3.1</sub>Si<sub>0.9</sub> as an unconventional superconductor and a noteworthy new member of the vanadium-based kagome material family.</p>}},
author = {{Graham, J. N. and Liu, H. and Sazgari, V. and Mielke, Charles and Medarde, M. and Luetkens, H. and Khasanov, R. and Shi, Y. and Guguchia, Z.}},
issn = {{2662-4443}},
language = {{eng}},
number = {{1}},
publisher = {{Springer Nature}},
series = {{Communications Materials}},
title = {{Microscopic probing of the superconducting and normal state properties of Ta<sub>2</sub>V<sub>3.1</sub>Si<sub>0.9</sub> by muon spin rotation}},
url = {{http://dx.doi.org/10.1038/s43246-024-00666-2}},
doi = {{10.1038/s43246-024-00666-2}},
volume = {{5}},
year = {{2024}},
}