Superconductivity in electron-doped layered TiNCl with variable interlayer coupling

Shuai Zhang; Masashi Tanaka; Shoji Yamanaka

doi:10.1103/PhysRevB.86.024516

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Superconductivity in electron-doped layered TiNCl with variable interlayer coupling

Shuai Zhang, Masashi Tanaka, Shoji Yamanaka

DOI 10.1103/PhysRevB.86.024516 · Physical Review B

T1

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Abstract

Titanium nitride chloride (TiNCl), a band semiconductor with the α-form layered structure, becomes a superconductor with a transition temperature Tc≈ 18.0 K by electron doping via alkali-metal intercalation. Upon cointercalation of various kinds of organic solvent molecules with alkali atoms, the superconducting layered crystals are swelled to different extents adjusting to the size of the molecules, and the Tc decreases linearly down to 6.5 K as a function of 1/d, where d is the interlayer separation (basal spacing) of the expanded nitride layers, implying the importance of the Coulomb interlayer coupling for superconductivity. This is in strong contrast to a previous finding that the Tc of the electron-doped ZrNCl and HfNCl with the β-form layered structure rather increases with the increase of d upon a similar cointercalation of solvent molecules.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	onset
Na0.16TiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.1	Pressure not reported	onset
Na0.16(THF)yTiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.2	Pressure not reported	onset
Na0.16(PC)yTiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.4	Pressure not reported	onset
Li0.13(THF)yTiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	onset
Li0.13TiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	onset
ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	unknown
HfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
TaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.8	Pressure not reported	unknown
NbS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.2	Pressure not reported	unknown