Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn_5

(2) Brookhaven National Laboratory; Canada; C. Petrovic (2); C. S. Turel (1); J. Berdeklis (1); J. Y. T. Wei (1) ((1) University of Toronto; M. A. Tanatar (1); P. M. C. Rourke (1); USA)

arxiv: cond-mat/0409562 · v2 · submitted 2004-09-22 · ❄️ cond-mat.supr-con · cond-mat.str-el

Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn₅

P. M. C. Rourke (1) , M. A. Tanatar (1) , C. S. Turel (1) , J. Berdeklis (1) , C. Petrovic (2) , J. Y. T. Wei (1) ((1) University of Toronto , Canada , (2) Brookhaven National Laboratory

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords multiplececoincomponentsdeltaorderpairingparametersuperconductor

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Point-contact spectroscopy was performed on single crystals of the heavy-fermion superconductor CeCoIn_5 between 150 mK and 2.5 K. A pulsed measurement technique ensured minimal Joule heating over a wide voltage range. The spectra show Andreev-reflection characteristics with multiple structures which depend on junction impedance. Spectral analysis using the generalized Blonder-Tinkham-Klapwijk formalism for d-wave pairing revealed two coexisting order parameter components, with amplitudes Delta_1 = 0.95 +/- 0.15 meV and Delta_2 = 2.4 +/- 0.3 meV, which evolve differently with temperature. Our observations indicate a highly unconventional pairing mechanism, possibly involving multiple bands.

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Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn₅

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