Abstract
Highly crystallized α-TiNCl and ZrNCl with orthogonal network of [M 2 N 2] (M: Ti and Zr) were used to synthesize the solid-solution phase α-Ti y Zr1−y NCl, which was irreversibly transformed into its β-form polymorph with honeycomb network upon a heat treatment. The intercalation of lithium (Li) into the obtained powder samples was carried out to realize the electron doping in β-form compound. The measurements of magnetic susceptibility and electrical resistivity suggest that the intercalated compound β-Li0.43Ti0.09Zr0.91NCl shows superconductivity with transition temperature (T c ) of 15.0 K. Upon the cointercalation of solvent molecule of tetrahydrofuran (THF), two transitions were observed at 14.1 and ∼21 K, corresponding to the main phase of β-Li x (THF) y ZrNCl and a THF-cointercalated phase of β-Ti y Zr1−y NCl, respectively. We consider that such a tiny substitution of Ti on Zr site in β-form structure play an important role in the increase of T c .
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