@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}},
}