Comment on “Experimental determination of superconducting parameters for the intermetallic perovskite superconductor MgCNi3”
Yu. G. Naidyuk
DOI 10.1103/PhysRevB.69.136501 · Physical Review B
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Abstract
In a recent paper [Phys. Rev. B 67, 094502 (2003)] Mao et al. investigated the bias-dependent conductance of mechanical junctions between superconducting MgCNi3 and a sharp W tip. They interpreted their results in terms of “single-particle tunneling.” We show it is more likely that current transport through those junctions is determined by thermal effects due to the huge normal-state resistivity of MgCNi3. Therefore no conclusion can be drawn about the possible unconventional pairing or strong-coupling superconductivity in MgCNi3.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Zr2Ni Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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