论文标题
各向异性完全传播的超导性可能是由无剂量有机络合物中的电荷波动介导的
Anisotropic Fully-Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex
论文作者
论文摘要
我们研究了非授予有机超导体超导体的低温电子特性$β^{\ prime \ prime} $ - （bedt-ttf）$ _ 4 $ [（H $ _3 $ o）通过检查超声属性，在$ t _ {\ rm cd} $ 4 \ sim $ 8〜K下方检测到没有磁场依赖的电荷违约（CD），就在超导临界温度上方$ t _ {\ rm c} $ tm c} $ tm c} $$ \ sim $ 6〜k。从高场中的量子振荡中，我们发现费米表面的变化和CD诱导的质量增强。热容量研究阐明了超导间隙功能完全覆盖在费米表面，但各向异性具有四倍的对称性。我们指出，超导性的配对机制可能由电荷波动主导。
We investigate low-temperature electronic properties of the nondimeric organic superconductor $β^{\prime\prime}$-(BEDT-TTF)$_4$[(H$_3$O)Ga(C$_2$O$_4$)$_3$]PhNO$_2$. By examining ultrasonic properties, charge disproportionation (CD) without magnetic field dependence is detected below $T_{\rm CD}$$\sim$8~K just above the superconducting critical temperature $T_{\rm c}$$\sim$6~K. 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.
