Superconductivity of Alkali Metal Intercalated β-Zirconium Nitride Chloride, AxZrNCl (A = Li, Na, K)
Superconductivity of Alkali Metal Intercalated β-Zirconium Nitride Chloride, AxZrNCl (A = Li, Na, K)
复制标题
DOI：
10.1021/cm970211b
复制
发表时间：
1997-10
影响因子：
8.6
通讯作者：
H. Kawaji;and Ken-ichi Hotehama;S. Yamanaka
中科院分区：
文献类型：
--
作者：
H. Kawaji;and Ken-ichi Hotehama;S. Yamanaka
以β-氯化氮化锆与正丁基锂或相应的碱金属萘为原料，合成了碱金属插层化合物AxZrNCl （A = Li, Na， K）。所有化合物都在转变温度（Tc）约为15k时成为超导体。极性溶剂分子如四氢呋喃、二甲基甲酰胺和碳酸丙烯与碱金属共插层，扩大了层间距。Tc仅依赖于插入碱金属的数量或掺杂水平；插层碱金属种类和层间分离对Tc的影响不大。虽然β-ZrNCl是一种半导体，但只需要少量的碱金属掺杂就可以实现超导性。过量的碱金属掺杂导致Tc下降到约9 K。
Alkali metal intercalated compounds AxZrNCl (A = Li, Na, K) were synthesized by the reaction of β-zirconium nitride chloride with n-butyllithium or the respective alkali metal naphthalenes. All of the compounds became superconductors with a transition temperature (Tc) of ca. 15 K. Polar solvent molecules such as tetrahydrofuran, dimethylformamide, and propylene carbonate were co-intercalated with the alkali metals, expanding the interlayer spacing. The Tc was dependent solely on the amount of intercalated alkali metals, or the doping level; the kind of intercalated alkali metals and the interlayer separation were not influential to the Tc. Although β-ZrNCl is a semiconductor, only a small amount of doping of alkali metals was necessary for the superconductivity. Too much doping with alkali metals resulted in the decrease of Tc down to ca. 9 K.