Possible unconventional pairing in (Ca,Sr)3(Ir,Rh)4Sn13 superconductors revealed by controlling disorder

Krenkel, Elizabeth H.; Tanatar, Makariy A.; Kończykowski, Marcin; Grasset, Romain; Timmons, Erik I.; Ghimire, Sunil; Joshi, Kamal R.; Lee, Yongbin; Ke, Liqin; Chen, Shuzhang; Petrovic, Cedomir; Orth, Peter P.; Scheurer, Mathias S.; Prozorov, Ruslan

doi:10.1103/physrevb.105.094521

Possible unconventional pairing in (Ca,Sr) 3 (Ir,Rh) 4 Sn13 superconductors revealed by controlling disorder

Journal Article · Wed Mar 30 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.094521· OSTI ID:1874486

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Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Ecole Polytechnique, Palaiseau (France)
Ames Lab., Ames, IA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Univ. Innsbruck (Austria)

Here we study the evolution of temperature-dependent resistivity with added pointlike disorder induced by 2.5 MeV electron irradiation in stoichiometric compositions of the “3-4-13” stannides, (Ca,Sr)₃(Ir,Rh)₄Sn₁₃. Three of these cubic compounds exhibit a proposed microscopic coexistence of charge density wave (CDW) order and superconductivity (SC), while Ca₃Rh₄Sn₁₃ does not develop CDW order. As expected, the CDW transition temperature T_CDW is universally suppressed by irradiation in all three compositions. The superconducting transition temperature, T_c, behaves in a more complex manner. In Sr₃Rh₄Sn₁₃, it increases initially in a way consistent with a direct competition of CDW and SC, but quickly saturates at higher irradiation doses. In the other three compounds, T_c is monotonically suppressed by irradiation. The strongest suppression is found in Ca₃Rh₄Sn₁₃, which does not have CDW order. We further examine this composition by measuring the London penetration depth λ(T), from which we derive the superfluid density. The result unambiguously points to a weak-coupling, full single gap, isotropic superconducting state. Therefore we must explain two seemingly incompatible experimental observations: a single isotropic superconducting gap and a significant suppression of T_c by nonmagnetic disorder. We conduct a quantitative theoretical analysis based on a generalized Anderson theorem which points to an unconventional multiband s^+–-pairing state where the sign of the order parameter is different on one (or a small subset) of the smaller Fermi surface sheets but remains isotropic and overall fully gapped.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358; SC0012704

OSTI ID:: 1874486

Alternate ID(s):: OSTI ID: 1889126

Report Number(s):: IS-J-10,764; BNL-223461-2022-JAAM

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 9 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Journal Article · Mon Jun 24 00:00:00 EDT 2024 · Journal of Physics. Condensed Matter · OSTI ID:2382774

Tuning charge density wave order and superconductivity in the kagome metals KV3Sb5–xSnx and RbV3Sb5–xSnx

Journal Article · Wed Jul 13 00:00:00 EDT 2022 · Physical Review Materials · OSTI ID:1982841

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
charge density waves
crystalline systems
electrical properties
irradiation effects
penetration depth
resistivity measurements
single crystal materials
superconductivity
superfluid density
surface and interfacial phenomena
transport techniques

Possible unconventional pairing in (Ca,Sr) 3 (Ir,Rh) 4 Sn13 superconductors revealed by controlling disorder

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