Peculiarities of the superconducting gaps and the electron-boson interaction in TmNi2B2C as seen by point-contact spectroscopy
Yu. G. Naidyuk, O. E. Kvitnitskaya, L. V. Tiutrina, I. K. Yanson, G. Behr, G. Fuchs, S.-L. Drechsler, K. Nenkov, L. Schultz
DOI 10.1103/PhysRevB.84.094516 · Physical Review B
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Abstract
Point-contact (PC) investigations on the title compound in the normal and superconducting (SC) state (Tc≃10.6 K) are presented. The temperature dependence of the SC gap of TmNi2B2C determined from Andreev-reflection (AR) spectra using the standard single-gap approximation (SGA) deviates from the BCS behavior in displaying a maximum at about Tc/2. A refined analysis within the two-gap approximation provides evidence for the presence of a second gap twice as large as the main gap (the first one), while the latter is close to that within the SGA. This way, TmNi2B2C expands the number of nickel borocarbide superconductors which exhibit a clear multiband character. Additionally, “reentrant” features were found in the AR spectra for some PCs measured in a magnetic field. The PC spectroscopy of the electron-boson interaction in TmNi2B2C in the normal state reveals a pronounced phonon maximum at 9.5 meV and a more smeared one at around 15 meV, while at higher energies the PC spectra are almost featureless. Additionally, the most intense peak slightly above 3 meV observed in the PC spectra of TmNi2B2C is presumably caused by crystalline-electric-field (CEF) excitations. The peak near 1 meV detected for some PC spectra is connected with a modification of the CEF, probably due to boron or carbon vacancies, allowing a probe of the local stoichiometry by PC spectroscopy.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TmNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.6 | Pressure not reported | midpoint |
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