Comment on "Experimental determination of superconducting parameters for the intermetallic perovskite superconductor MgCNi$_3$"

Details Comment on "Experimental determination of superconducting parameters for the intermetallic perovskite superconductor MgCNi$_3$" Comment on "Experimental determination of superconducting parameters for the intermetallic perovskite superconductor MgCNi$_3$"

2003-12-16

arxiv.org/abs/cond-mat/0312397v1

Phys. Rev. B, V.69, 136501 (2004)

Physics

Condensed Matter

Superconductivity

2 pages, 1 Fig. Comment on Z. Q. Mao et al. (Phys. Rev. {\bf B 67}, 094502 (2003))

Scientific paper

10.1103/PhysRevB.69.136501

In a recent paper (Phys. Rev. {\bf B 67}, 094502 (2003)) Mao et al. investigated the bias-dependent conductance of mechanical junctions between superconducting MgCNi$_3$ 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 MgCNi$_3$. Therefore no conclusion can be drawn about the possible unconventional pairing or strong-coupling superconductivity in MgCNi$_3$.

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