Probing the superconducting properties of the Si-doped Nb-oxynitride superconductor (Nb0.87Si0.09□0.04)(N0.87O0.13)
A. D. Hillier, Y. Ohashi, S. Kikkawa, J. V. Yakhmi
DOI 10.1103/PhysRevB.90.014508 · Physical Review B
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Abstract
The superconducting state of the 17 K Si-doped Nb-oxynitride superconductor, namely, (Nb0.87Si0.09□0.04)(N0.87O0.13), has been investigated using muon spin rotation and relaxation. Our results show that there is no evidence of time-reversal symmetry breaking and that the temperature dependence of the magnetic penetration depth is consistent with an isotropic singlet “s-wave” ground state. The magnetic penetration depth has been determined to be 218(5) nm and the superconducting gap was found to be 3.4(1) meV, giving a BCS ratio of 4.6. The superelectron density and effective mass were found to be 8.7×1027 m−3 and 15me, respectively. Also, using the Uemura plot, it is suggested that the mechanisms for superconductivity in this material may not be entirely conventional and could be similar to the cuprates, organics, and heavy fermion systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Nb0.87Si0.09□0.04)(N0.87O0.13) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | unknown |
| (Nb0.95Mg0.05)(N0.92O0.08) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | unknown |
| (Nb0.89Al0.11)(N0.84O0.16) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | unknown |
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