论文标题
LuxZR1-XB12 DETECABORIDES中的不均匀超导性具有动态电荷条纹
Inhomogeneous superconductivity in LuxZr1-xB12 dodecaborides with dynamic charge stripes
论文作者
论文摘要
我们已经研究了模型的正常和超导状态特性（电阻率，霍尔系数，热容量和磁化）与硼刚性固定笼子的合作jahn-teller不稳定和动态电荷条纹的合作jahn-teller不稳定和合作的jahn-teller不稳定。发现这些金属是S波脏极限超导体，其平均平均自由载载器l = 5-140 a，并且在450-4000 A范围内，库珀对尺寸不变。 Ginzburg-landau-maki参数以0.65 <kappa1,2 <6。我们主张luxzr1-xb12中的两波段超导场景，具有间隙值delta_1〜14 k和delta_2〜6-8 k，并相对于coupling coupling limit，lug delta_1〜14 k和delta_2〜6-8 k（lux_1〜14 k），并相得大在较低的耦合（lambda_e -ph 〜0.1-0.4）。在TC上方，在LuxZr1-XB12中观察到了pseudogap delta_ps-gap〜60-110 k。我们还讨论了与条纹诱导的成对和各向异性的各向异性单波段超导性的可能性，并分析了这些模型化合物中检测到的独特增强表面超导性的起源。
We have studied the normal and superconductive state characteristics (resistivity, Hall coefficient, heat capacity and magnetization) of model strongly correlated electronic systems LuxZr1-xB12 with cooperative Jahn-Teller instability of the boron rigid cage and with dynamic charge stripes. It was found that these metals are s-wave dirty limit superconductors with a small mean free path of charge carriers l = 5 - 140 A and with a Cooper pair size changing non-monotonously in the range 450 - 4000 A. The parent ZrB12 and LuB12 borides are type-I superconductors, and Zr to Lu substitution induces a type-I - type-II phase transition providing a variation of the Ginzburg-Landau-Maki parameter in the limits 0.65 < kappa1,2 < 6. We argue in favor of the two-band scenario of superconductivity in LuxZr1-xB12 with gap values Delta_1 ~ 14 K and Delta_2 ~ 6 - 8 K, with pairing corresponding to strong coupling limit (lambda_e-ph ~ 1) in the upper band, and to weak coupling (lambda_e-ph ~ 0.1 - 0.4) in the lower one. A pseudogap Delta_ps-gap ~ 60 - 110 K is observed in LuxZr1-xB12 above Tc. We discuss also the possibility of anisotropic single-band superconductivity with stripe-induced both pair-breaking and anisotropy, and analyze the origin of unique enhanced surface superconductivity detected in these model compounds.
