Interlayer-Spacing Dependence of Tc in LixMyHfNCl (M: Molecule) Superconductors

T. Takano; T. Kishiume; Y. Taguchi; Y. Iwasa

doi:10.1103/PhysRevLett.100.247005

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Interlayer-Spacing Dependence of Tc in LixMyHfNCl (M: Molecule) Superconductors

T. Takano, T. Kishiume, Y. Taguchi, Y. Iwasa

DOI 10.1103/PhysRevLett.100.247005 · Physical Review Letters

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Abstract

We have systematically investigated the global phase diagram for LixMyHfNCl (M: molecule), demonstrating the independent controllability of carrier density x and interlayer spacing d. In LixHfNCl, the superconducting phase with almost constant Tc of 20 K prevails for 0.15≤x≤0.50. Accompanied by an increase in d upon the cointercalation, an enhancement of Tc up to 30% was observed with its x independence preserved. This result indicates that pairing interaction strongly depends on the Fermi surface warping along the kz direction, implying the relevance of charge and/or spin fluctuation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LixHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	onset
Li0.37HfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	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.	—	Pressure not reported	unknown
Li0.12ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown