Superconductivity of fcc fullerides containing off-centered octahedral cations.
Superconductivity of fcc fullerides containing off-centered octahedral cations.
复制标题
含有偏心八面体阳离子的面心立方富勒烯的超导性。
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
Mitani
中科院分区：
文献类型：
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作者：
Shimoda;Iwasa;Miyamoto;Maniwa;Mitani
Low-temperature synthesis in liquid ammonia yielded the superconductors ${(mathrm{N}{mathrm{H}}_{3})}_{x}mathrm{Na}{A}_{2}{mathrm{C}}_{60}$ ($0.5lxl1$, $A=mathrm{K}mathrm{and}mathrm{Rb}$). These compounds retained the fcc cell with a tunable lattice constant around $a=14.37$ AA{} and $a=14.52$ AA{} for K and Rb compounds, respectively, by controlling the ammonia concentration $x$. ${T}_{c}$ of both compounds decreases with increasing lattice parameter, in a striking contrast with the empirical correlation. A Na-N${mathrm{H}}_{3}$ cluster occupies the octahedral interstice and remaining K or Rb occupies the tetrahedral site. The Na ion is displaced by 0.4-0.6 AA{} from the center of the octahedral site.
Low-temperature synthesis in liquid ammonia yielded the superconductors ${(mathrm{N}{mathrm{H}}_{3})}_{x}mathrm{Na}{A}_{2}{mathrm{C}}_{60}$ ($0.5lxl1$, $A=mathrm{K}mathrm{and}mathrm{Rb}$). These compounds retained the fcc cell with a tunable lattice constant around $a=14.37$ AA{} and $a=14.52$ AA{} for K and Rb compounds, respectively, by controlling the ammonia concentration $x$. ${T}_{c}$ of both compounds decreases with increasing lattice parameter, in a striking contrast with the empirical correlation. A Na-N${mathrm{H}}_{3}$ cluster occupies the octahedral interstice and remaining K or Rb occupies the tetrahedral site. The Na ion is displaced by 0.4-0.6 AA{} from the center of the octahedral site.