Discovery of superconductivity in quasicrystal.
Discovery of superconductivity in quasicrystal.
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DOI：
10.1038/s41467-017-02667-x
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发表时间：
2018-01-11
影响因子：
16.6
通讯作者：
Sato NK
中科院分区：
文献类型：
--
作者：
Kamiya K;Takeuchi T;Kabeya N;Wada N;Ishimasa T;Ochiai A;Deguchi K;Imura K;Sato NK
超导性普遍存在于许多晶体中，包括载流子掺杂的氧化物和金刚石。无定形固体也不例外。然而，它仍然有待于在准晶体中发现，在准晶体中，原子是长距离有序的，而不是周期性重复的排列。本文报告了Al-Zn-Mg准晶体的电阻率、磁化强度和比热测量结果，为在非常低的k转变温度下出现大块超导性提供了令人信服的证据。我们还发现其近似晶体中的超导性，结构是周期性的，但与准晶体非常相似。这些观察结果表明，在原子排列从周期排列到准周期排列的变化中，电子之间的有效相互作用仍然具有吸引力。分形几何与超导相互作用的超导准晶体的发现，为一种新型的超导——分形超导打开了大门。超导性在晶体和非晶固体中得到证实，但在准晶体中有待发现。在这里，Kamiya等人报道了Al-Zn-Mg准晶体在0.05 K左右的极低转变温度下出现大块超导性。
Superconductivity is ubiquitous as evidenced by the observation in many crystals including carrier-doped oxides and diamond. Amorphous solids are no exception. However, it remains to be discovered in quasicrystals, in which atoms are ordered over long distances but not in a periodically repeating arrangement. Here we report electrical resistivity, magnetization, and specific-heat measurements of Al–Zn–Mg quasicrystal, presenting convincing evidence for the emergence of bulk superconductivity at a very low transition temperature of K. We also find superconductivity in its approximant crystals, structures that are periodic, but that are very similar to quasicrystals. These observations demonstrate that the effective interaction between electrons remains attractive under variation of the atomic arrangement from periodic to quasiperiodic one. The discovery of the superconducting quasicrystal, in which the fractal geometry interplays with superconductivity, opens the door to a new type of superconductivity, fractal superconductivity. Superconductivity is evidenced in crystals and amorphous solids, but remains to be discovered in quasicrystals. Here, Kamiya et al. report the emergence of bulk superconductivity in Al-Zn-Mg quasicrystal at a very low transition temperature about 0.05 K.
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