论文标题
tlbi $ _2 $的超导率具有大型kadowaki-woods比率
Superconductivity in TlBi$_2$ with a large Kadowaki-Woods ratio
论文作者
论文摘要
在本文中，通过电阻率，磁化强度和特定的热量测量结果研究了TLBI $ _2 $的超导和正常状态特性。发现与$ t_ {C} $ = 6.2 K的散装超导率在TLBI $ _2 $中出现，这是一种响应$ s $ s $ s $ s $ s $ s $ s $ s $ s $ - wave超级导管，具有强烈的电子 - phonon耦合（$λ$λ$ _ {EP} $ = 1.38），并且是大型超级超级大管gap gap gap gap （$δ_{0} $/$ k_ {b} t_ {c} $ = 2.25）。我们发现，$ρ$（$ t $）在50 k以上表现出不寻常的$ t $ linear依赖性，并且可以通过低于20 k的费米 - 液体理论来很好地描述。 k $^{2} $/mj）$^{2} $]出乎意料的是，尽管电子相关性并不那么强，但在许多重型Fermi化合物中所获得的订单比在许多重型Fermi化合物中获得的顺序大。
In this article, the superconducting and normal state properties of TlBi$_2$ with the AlB$_2$-type structure were studied by the resistivity, magnetization and specific heat measurements. It was found that bulk superconductivity with $T_{C}$ = 6.2 K emerges in TlBi$_2$, which is a phonon-mediated $s$-wave superconductor with a strong electron-phonon coupling ($λ$$_{ep}$ = 1.38) and a large superconducting gap ($Δ_{0}$/$k_{B}T_{C}$ = 2.25). We found that the $ρ$($T$) exhibits an unusual $T$-linear dependence above 50 K, and can be well described by the Fermi-liquid theory below 20 K. Interestingly, its Kadowaki-Woods ratio $A/γ^{2}$ [9.2$\times$10$^{-5}$ $μΩ$ cm(mol K$^{2}$/mJ)$^{2}$] is unexpectedly one order of magnitude larger than that obtained in many heavy Fermi compounds, although the electron correlation is not so strong.
