Prediction of High Tc Superconductivity in Hole-Doped LiBC

H. Rosner; A. Kitaigorodsky; W. E. Pickett

doi:10.1103/PhysRevLett.88.127001

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Prediction of High Tc Superconductivity in Hole-Doped LiBC

H. Rosner, A. Kitaigorodsky, W. E. Pickett

DOI 10.1103/PhysRevLett.88.127001 · Physical Review Letters

T1

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Abstract

The layered lithium borocarbide LiBC, isovalent with and structurally similar to the superconductor MgB2, is an insulator due to the modulation within the hexagonal layers (BC vs B2). We show that hole doping of LiBC results in Fermi surfaces of B-C pσ character that couple very strongly to B-C bond stretching modes, precisely the features that lead to superconductivity at Tc≃40K in MgB2. Comparison of Li0.5BC with MgB2 indicates the former to be a prime candidate for electron-phonon coupled superconductivity at substantially higher temperature than in MgB2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Li0.5BC Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	100	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown