Superconductivity near Ferromagnetism in MgCNi3
H. Rosner, R. Weht, M. D. Johannes, W. E. Pickett, E. Tosatti
DOI 10.1103/PhysRevLett.88.027001 · Physical Review Letters
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Abstract
An unusual quasi-two-dimensional heavy band mass van Hove singularity (vHs) lies very near the Fermi energy in MgCNi3, recently reported to superconduct at 8.5 K. This compound is strongly exchange enhanced and unstable to ferromagnetism upon hole doping with ∼12% Mg→Na or Li (i.e., 0.04 hole/Ni). We identify an essentially infinite mass along the M−Γ line, which accounts for the two dimensionality of this vHs. This compound provides new opportunities to probe the ferromagnetic critical point as well as introducing the novelties of 2D behavior into a 3D system.
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. | 8.5 | Pressure not reported | unknown |
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