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

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 happens 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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358; AC02-98CH10886; FG02-04ER46105

OSTI ID:: 1193220

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

Report Number(s):: BNL--108084-2015-JA; IS--J-8497; KC0201050

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Theory of scanning tunneling spectroscopy: from Kondo impurities to heavy fermion materials Morr, Dirk K. Reports on Progress in Physics, Vol. 80, Issue 1 https://doi.org/10.1088/0034-4885/80/1/014502	journal	November 2016
From Ising Resonant Fluctuations to Static Uniaxial Order in Antiferromagnetic and Weakly Superconducting CeCo ( In 1 − x Hg x ) 5 ( x = 0.01 ) Stock, C.; Rodriguez-Rivera, J. A.; Schmalzl, K. Physical Review Letters, Vol. 121, Issue 3 https://doi.org/10.1103/physrevlett.121.037003	journal	July 2018
Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce$_{1-x}$Yb$_{x}$CoIn$_5$ Song, Yu; Van Dyke, John; Lum, I. K. arXiv https://doi.org/10.48550/arxiv.1607.05326	text	January 2016

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