Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Microscopic study of the impurity effect in the kagome superconductor La⁢(Ru1–x⁢Fex)3⁢Si2

Journal Article · · Physical Review. B
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2];  [3];  [2];  [2];  [2];  [2];  [5];  [6];  [2];  [2];  [2];  [2]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. of Zurich (Switzerland)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Univ. of Zurich (Switzerland)
  4. Univ. of Tokyo (Japan)
  5. Princeton Univ., NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Quantum Science Center (QSC)
  6. Univ. of Tokyo (Japan); Johns Hopkins Univ., Baltimore, MD (United States); Canadian Institute for Advanced Research (CIFAR), Toronto, ON (Canada)
+ Show Author Affiliations

Here, we report on the effect of magnetic impurities on the microscopic superconducting (SC) properties of the kagome-lattice superconductor La⁢(Ru1–xFex)3⁢Si2 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2425959
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 13 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (44)

New ternary superconductors with silicon journal October 1980
The crystal structure of a new ternary silicide in the system rare-earth-ruthenium-silicon journal October 1980
Coexistence of superconductivity and spin glass freezing in La0.95Gd0.05Ru3Si2 journal March 1987
Recent advances in magnetic structure determination by neutron powder diffraction journal October 1993
Magnetic penetration depth of MgB2 journal March 2003
Musrfit: A Free Platform-Independent Framework for μSR Data Analysis journal January 2012
Magnetic-field penetration depth in K3C60 measured by muon spin relaxation journal August 1991
Massive Dirac fermions in a ferromagnetic kagome metal journal March 2018
Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor journal November 2015
Signatures of the topological s +− superconducting order parameter in the type-II Weyl semimetal T d-MoTe2 journal October 2017
Tunable anomalous Hall conductivity through volume-wise magnetic competition in a topological kagome magnet journal January 2020
Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5 journal January 2023
Microscopic evidence for anisotropic multigap superconductivity in the CsV3Sb5 kagome superconductor journal April 2022
Topology and correlations on the kagome lattice journal January 2020
Unconventional chiral charge order in kagome superconductor KV3Sb5 journal June 2021
Charge order and superconductivity in kagome materials journal December 2021
Giant and anisotropic many-body spin–orbit tunability in a strongly correlated kagome magnet journal September 2018
Time-reversal symmetry-breaking charge order in a kagome superconductor journal February 2022
Topological kagome magnets and superconductors journal December 2022
Nodeless electron pairing in CsV3Sb5-derived kagome superconductors journal April 2023
Low-temperature magnetic crossover in the topological kagome magnet TbMn6Sn6 journal May 2022
Two types of charge order with distinct interplay with superconductivity in the kagome material CsV3Sb5 journal September 2022
Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu2 journal October 2022
Enhanced T c and multiband superconductivity in the fully-gapped ReBe 22 superconductor journal July 2019
Kagome superconductors AV3Sb5 (A = K, Rb, Cs) journal September 2022
Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in the kagome metals A V 3 Sb 5 ( A =K, Rb, Cs) journal July 2021
Effect of tunable spin-orbit coupling on the superconducting properties of LaRu3Si2 containing kagome-honeycomb layers journal January 2023
Flux distribution and penetration depth measured by muon spin rotation in high-T_{c} superconductors journal February 1988
Type-II superconductivity in a dilute magnetic system:La1−xTmxRu3Si2 journal May 1994
Jump in specific heat at the superconducting transition temperature in Ba ( Fe 1 − x Co x ) 2 As 2 and Ba ( Fe 1 − x Ni x ) 2 As 2 single crystals journal June 2009
Anomalous properties in the normal and superconducting states of LaRu 3 Si 2 journal December 2011
Gap nodes induced by coexistence with antiferromagnetism in iron-based superconductors journal April 2012
Distinct behaviors of suppression to superconductivity in LaRu3Si2induced by Fe and Co dopants journal July 2012
Competing electronic orders on kagome lattices at van Hove filling journal March 2013
Probing the pairing symmetry in the over-doped Fe-based superconductor Ba 0.35 Rb 0.65 Fe 2 As 2 as a function of hydrostatic pressure journal March 2016
Chemical doping effect in the LaRu 3 Si 2 superconductor with a kagome lattice journal September 2016
Unconventional Fermi Surface Instabilities in the Kagome Hubbard Model journal March 2013
Cs V 3 Sb 5 : A Z 2 Topological Kagome Metal with a Superconducting Ground State journal December 2020
Universal Correlations between T c and n s m * (Carrier Density over Effective Mass) in High- T c Cuprate Superconductors journal May 1989
Muon-Spin-Rotation Measurements of the Penetration Depth of the Infinite-Layer Electron-Doped Sr 0.9 La 0.1 CuO 2 Cuprate Superconductor journal March 2005
Nodeless kagome superconductivity in LaRu 3 Si 2 journal March 2021
Time-reversal symmetry broken by charge order in CsV3Sb5 journal June 2022
μSR studies of the vortex state in type-II superconductors journal July 2000
Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides journal November 2019

Similar Records

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Kagome lattice
muon spin relaxation & rotation
superconductivity
unconventional superconductors