Nodal to nodeless superconducting energy-gap structure change concomitant with Fermi-surface reconstruction in the heavy-fermion compound CeCoIn5

Kim, Hyunsoo; Tanatar, M. A.; Flint, R.; Petrovic, C.; Hu, Rongwei; White, B. D.; Lum, I. K.; Maple, M. B.; Prozorov, R.

doi:10.1103/PhysRevLett.114.027003

Title: Nodal to nodeless superconducting energy-gap structure change concomitant with Fermi-surface reconstruction in the heavy-fermion compound ${CeCoIn}_{5}$

Journal Article · Thu Jan 15 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.027003· OSTI ID:1193220

Kim, Hyunsoo ^[1]; Tanatar, M. A. ^[1]; Flint, R. ^[1]; Petrovic, C. ^[2]; Hu, Rongwei ^[2]; White, B. D. ^[3]; Lum, I. K. ^[3]; Maple, M. B. ^[3]; Prozorov, R. ^[1]

Iowa State Univ., Ames, IA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of California, San Diego, La Jolla, CA (United States)

The London penetration depth, λ(T), was measured in single crystals of Ce_1-xR_xCoIn₅, R=La, Nd and Yb down to T_min ≈ 50 mK (T_c/T_min ~50) using a tunnel-diode resonator. In the cleanest samples Δλ(T) is best described by the power law, Δλ(T) ∝ Tⁿ, with n ~ 1, consistent with line nodes. Substitutions of Ce with La, Nd and Yb lead to similar monotonic suppressions of T_c, however the effects on Δλ(T) differ. While La and Nd dopings lead to increase of the exponent n and saturation at n ~ 2, as expected for a dirty nodal superconductor, Yb doping leads to n > 3, suggesting a change from nodal to nodeless superconductivity. As a result, this superconducting gap structure change happen in the same doping range where changes of the Fermi surface topology were reported, implying that the nodal structure and Fermi surface topology are closely linked.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; AC02-07CH11358; Ac02-98CH10886; FG02-04-ER46105; FA9550-09-1-0603

OSTI ID:: 1193220

Alternate ID(s):: OSTI ID: 1180782; OSTI ID: 1225380

Report Number(s):: BNL-108084-2015-JA; IS-J-8497; PRLTAO; R&D Project: PM016; KC0201050

Journal Information:: Physical Review Letters, Vol. 114, Issue 2; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Title: Nodal to nodeless superconducting energy-gap structure change concomitant with Fermi-surface reconstruction in the heavy-fermion compound ${CeCoIn}_{5}$