SUPERCONDUCTIVITY AT 18-K IN POTASSIUM-DOPED C-60
SUPERCONDUCTIVITY AT 18-K IN POTASSIUM-DOPED C-60
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DOI：
10.1038/350600a0
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发表时间：
1991-04-18
期刊：
影响因子：
64.8
通讯作者：
KORTAN, AR
中科院分区：
文献类型：
--
作者：
HEBARD, AF;ROSSEINSKY, MJ;KORTAN, AR
宏观量的C60和C70（富勒烯）1的合成刺激了对其化学和物理性质的各种研究2，3。 我们最近证明了C60和C70在掺杂碱金属4时变得导电。 在这里，我们描述了低温研究的钾掺杂C60作为薄膜和散装样品，并证明这种材料成为超导。 超导电性通过微波、电阻率和迈斯纳效应测量来证明。 多晶粉末和薄膜样品进行了研究。 薄膜显示出电阻转变，起始温度为16 K，在5 K附近电阻基本为零。 体样品在18 K时表现出明显的迈斯纳效应和磁场依赖的微波吸收。 在18 K时开始的超导性是迄今为止观察到的分子超导体的最高值。
THE synthesis of macroscopic amounts of C60 and C70 (fullerenes) 1 has stimulated a variety of studies on their chemical and physical properties 2,3. We recently demonstrated that C60 and C70 become conductive when doped with alkali metals 4. Here we describe low-temperature studies of potassium-doped C60 both as films and bulk samples, and demonstrate that this material becomes superconducting. Superconductivity is demonstrated by microwave, resistivity and Meissner-effect measurements. Both polycrystalline powders and thin-film samples were studied. A thin film showed a resistance transition with an onset temperature of 16 K and essentially zero resistance near 5 K. Bulk samples showed a well-defined Meissner effect and magnetic-field-dependent microwave absorption beginning at 18 K. The onset of superconductivity at 18 K is the highest yet observed for a molecular superconductor.