Superconductivity in the hexagonal-layered molybdenum carbide η−Mo3C2

K. Yamaura; Q. Huang; M. Akaishi; E. Takayama-Muromachi

doi:10.1103/PhysRevB.74.184510

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Superconductivity in the hexagonal-layered molybdenum carbide η−Mo3C2

K. Yamaura, Q. Huang, M. Akaishi, E. Takayama-Muromachi

DOI 10.1103/PhysRevB.74.184510 · Physical Review B

T1

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Abstract

The hexagonal-layered superconductor η−Mo3C2 (Tc=8.5K) was investigated by neutron diffraction, magnetic susceptibility, and specific-heat measurements. A significant layered character was found in the structure, which comprises edge-sharing CMo6 octahedra sheets and ∼50% carbon occupied blocks. Magnetic characterization revealed the Ginzburg-Landau parameter of η−Mo3C2 is ∼26, which is close to that for the comparable Tc compound Li2Pd3B (∼21), but less than a half of that for MgCNi3 (∼54). The molybdenum carbide would provide valuable opportunities to deepen understanding of those unconventional superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo3C2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.5	Pressure not reported	onset
Mo3C1.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.9	Pressure not reported	onset
Mo3C1.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.4	Pressure not reported	midpoint
Mo3C1.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.2	Pressure not reported	midpoint
Li2Pd3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
MoC1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14.7	Pressure not reported	unknown