Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex
Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex
复制标题
非二聚有机配合物中电荷波动可能介导的各向异性全能隙超导性
DOI：
10.1103/physrevlett.125.177002
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发表时间：
2020
影响因子：
8.6
通讯作者：
Nakazawa Y.
中科院分区：
文献类型：
--
作者：
Imajo S.;Akutsu H.;Kurihara R.;Yajima T.;Kohama Y.;Tokunaga M.;Kindo K.;Nakazawa Y.
我们研究非二聚有机超导体的低温电子特性。通过检查超声波特性，可以在超导临界温度以下检测到不依赖于磁场的电荷歧化 (CD)。从高场中的量子振荡中，我们发现了费米表面的变化和 CD 引起的质量增强。热容研究表明，超导能隙函数在费米面上完全有隙，但具有四重对称性且各向异性。我们指出超导的配对机制可能由电荷涨落主导。
We investigate low-temperature electronic properties of the nondimeric organic superconductor. By examining ultrasonic properties, charge disproportionation (CD) without magnetic field dependence is detected belowjust above the superconducting critical temperature. From quantum oscillations in high fields, we find variation in the Fermi surface and mass enhancement induced by the CD. Heat capacity studies elucidate that the superconducting gap function is fully gapped in the Fermi surface, but anisotropic with fourfold symmetry. We point out that the pairing mechanism of the superconductivity is possibly dominated by charge fluctuations.