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

Abstract

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${}_3$.

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

References in corpus (2)

• Experimental determination of superconducting parameters for the intermetallic perovskite superconductor ${\text {MgCNi}}_3
• Normal state resistivity, upper critical field and Hall effect in superconducting perovskite $MgCN{i}_3$

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