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Title: Possible unconventional pairing in ( Ca , Sr ) 3 ( Ir , Rh ) 4 Sn 13 superconductors revealed by controlling disorder

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [3];  [4]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  2. Ecole Polytechnique, Palaiseau (France)
  3. Ames Lab., Ames, IA (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  5. 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 TCDW is universally suppressed by irradiation in all three compositions. The superconducting transition temperature, Tc, 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, Tc 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 Tc 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.

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; EMIR&A
Grant/Contract Number:
AC02-07CH11358; SC0012704; AC02-07CH1135; CNRS 3618
OSTI ID:
1874486
Alternate ID(s):
OSTI ID: 1889126
Report Number(s):
IS-J-10,764; BNL-223461-2022-JAAM; TRN: US2306673
Journal Information:
Physical Review. B, Vol. 105, Issue 9; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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