Unconventional Superconductivity in Electron-Doped Layered Li0.48(THF)yHfNCl

H. Tou; Y. Maniwa; T. Koiwasaki; S. Yamanaka

doi:10.1103/PhysRevLett.86.5775

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Unconventional Superconductivity in Electron-Doped Layered Li0.48(THF)yHfNCl

H. Tou, Y. Maniwa, T. Koiwasaki, S. Yamanaka

DOI 10.1103/PhysRevLett.86.5775 · Physical Review Letters

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Abstract

We report magnetic susceptibility measurements on a layered superconductor Li0.48(THF)0.3HfNCl having Tc∼26K. The present study revealed that (a) the Fermi level density of states is small, N*(EF)∼0.25states/(eVspinf.u.), (b) mass enhancement is negligible, γ̃∼1, (c) electron-phonon coupling is weak, λep≪1, (d) exchange enhancement is negligible, 1/(1+F0a)∼1, and (e) electronic density parameter is large, rs2D∼10.3 (i.e., low-carrier density). It is difficult to explain the origin of the high Tc in terms of the conventional phonon (BCS) mechanism of superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Li0.48(THF)0.3HfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.56	Pressure not reported	onset
Li0.48(THF)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	unknown