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• W1971452023 abstract "Dynamic conductance spectra are taken from Au/CeCoIn$_5$ point contacts in the Sharvin limit along the (001) and (110) directions. Our conductance spectra, reproducibly obtained over wide ranges of temperature, constitute the cleanest data sets ever reported for HFSs. A signature for the emerging heavy-fermion liquid is evidenced by the development of the asymmetry in the background in the normal state. Below $T_c$, an enhancement of the sub-gap conductance arising from Andreev reflection is observed, with the magnitude of $sim$ 13.3 % and $sim$ 11.8 % for the (001) and the (110) point contacts, respectively, an order of magnitude smaller than those observed in conventional superconductors but consistent with those in other HFSs. Our zero-bias conductance data for the (001) point contacts are best fit with the extended BTK model using the d-wave order parameter. The fit to the full conductance curve of the (001) point contact indicates the strong coupling nature ($2Delta/k_{B}T_c = 4.64$). However, our observed suppression of both the Andreev reflection signal and the energy gap indicates the failure of existing models. We provide possible directions for theoretical formulations of the electronic transport across an N/HFS interface. Several qualitative features observed in the (110) point contacts provide the first clear spectroscopic evidence for the $d_{x^2-y^2}$ symmetry." @default.
• W1971452023 created "2016-06-24" @default.
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• W1971452023 date "2005-08-18" @default.
• W1971452023 modified "2023-09-23" @default.
• W1971452023 title "Suppressed Andreev reflection at the normal-metal/heavy-fermion superconductor CeCoIn 5 interface" @default.
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• W1971452023 doi "https://doi.org/10.1117/12.622251" @default.
• W1971452023 hasPublicationYear "2005" @default.
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