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Microscopic study of the impurity effect in the kagome superconductor La(Ru1-xFex)3Si2

Mielke, C. ; Das, D. ; Spring, J. ; Nakamura, Hisayoshi ; Shin, S. ; Liu, H. ; Sazgari, V. ; Jöhr, S. ; Lyu, J. and Graham, J. N. LU , et al. (2024) In Physical Review B 109(13).
Abstract

We report on the effect of magnetic impurities on the microscopic superconducting (SC) properties of the kagome-lattice superconductor La(Ru1-xFex)3Si2 using muon spin relaxation/rotation. A strong suppression of the superconducting critical temperature Tc, the SC volume fraction, and the superfluid density was observed. We further find a correlation between the superfluid density and Tc which is considered a hallmark feature of unconventional superconductivity. Most remarkably, measurements of the temperature-dependent magnetic penetration depth λ reveal a change in the low-temperature behavior from exponential saturation to a linear increase, which indicates that Fe doping introduces nodes in the superconducting gap structure at... (More)

We report on the effect of magnetic impurities on the microscopic superconducting (SC) properties of the kagome-lattice superconductor La(Ru1-xFex)3Si2 using muon spin relaxation/rotation. A strong suppression of the superconducting critical temperature Tc, the SC volume fraction, and the superfluid density was observed. We further find a correlation between the superfluid density and Tc which is considered a hallmark feature of unconventional superconductivity. Most remarkably, measurements of the temperature-dependent magnetic penetration depth λ reveal a change in the low-temperature behavior from exponential saturation to a linear increase, which indicates that Fe doping introduces nodes in the superconducting gap structure at concentrations as low as x=0.015. Our results point to a rare example of unconventional superconductivity in the correlated kagome lattice and accessible tunability of the superconducting gap structure, offering new insights into the microscopic mechanisms involved in superconducting order.

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publishing date
type
Contribution to journal
publication status
published
in
Physical Review B
volume
109
issue
13
article number
134501
publisher
American Physical Society
external identifiers
  • scopus:85189369372
ISSN
2469-9950
DOI
10.1103/PhysRevB.109.134501
language
English
LU publication?
no
additional info
Publisher Copyright: © 2024 American Physical Society.
id
a24e69f3-5c56-49c7-b90c-ac30eec55a49
date added to LUP
2026-05-28 17:37:05
date last changed
2026-06-02 08:35:28
@article{a24e69f3-5c56-49c7-b90c-ac30eec55a49,
  abstract     = {{<p>We report on the effect of magnetic impurities on the microscopic superconducting (SC) properties of the kagome-lattice superconductor La(Ru1-xFex)3Si2 using muon spin relaxation/rotation. A strong suppression of the superconducting critical temperature Tc, the SC volume fraction, and the superfluid density was observed. We further find a correlation between the superfluid density and Tc which is considered a hallmark feature of unconventional superconductivity. Most remarkably, measurements of the temperature-dependent magnetic penetration depth λ reveal a change in the low-temperature behavior from exponential saturation to a linear increase, which indicates that Fe doping introduces nodes in the superconducting gap structure at concentrations as low as x=0.015. Our results point to a rare example of unconventional superconductivity in the correlated kagome lattice and accessible tunability of the superconducting gap structure, offering new insights into the microscopic mechanisms involved in superconducting order.</p>}},
  author       = {{Mielke, C. and Das, D. and Spring, J. and Nakamura, Hisayoshi and Shin, S. and Liu, H. and Sazgari, V. and Jöhr, S. and Lyu, J. and Graham, J. N. and Shiroka, T. and Medarde, M. and Hasan, M. Z. and Nakatsuji, S. and Khasanov, R. and Gawryluk, D. J. and Luetkens, H. and Guguchia, Z.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{13}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Microscopic study of the impurity effect in the kagome superconductor La(Ru1-xFex)3Si2}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.109.134501}},
  doi          = {{10.1103/PhysRevB.109.134501}},
  volume       = {{109}},
  year         = {{2024}},
}