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Quantum oscillations of the superconductor LaRu_2P_2: Comparable mass enhancement λ≈1 in Ru and Fe phosphides

机译:超导体LaRu_2P_2的量子振荡:Ru和Fe磷化物的质量增强λ≈1

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We have studied the angular-dependent de Haas-van Alphen oscillations of LaRu_2P_2 using magnetic torque in pulsed magnetic fields up to 60 T. The observed oscillation frequencies are in excellent agreement with the geometry of the calculated Fermi surface. The temperature dependence of the oscillation amplitudes reveals effective masses m~*(α) = 0.71 and m~*(β) = 0.99 m_e, which are enhanced over the calculated band mass by λ~(cyc) of 0.8. We find a similar enhancement of λ~γ ≈1 in comparing the measured electronic specific heat (γ = 11.5 mJ/mol K~2) with the total density of states from band-structure calculations. Remarkably, very similar mass enhancements have been reported in other pnictides, LaFe_2P_2, LaFePO (T_c≈4 K), and LaRuPO, independent of whether they are superconducting or not. This is contrary to the common perceptions that the normal-state quasiparticle renormalizations reflect the strength of the superconducting pairing mechanism and leads to new questions about pairing in isostructural and isoelectronic Ru- and Fe-pnictide superconductors.
机译:我们已经使用高达60 T的脉冲磁场中的磁转矩研究了LaRu_2P_2的角度相关的de Haas-van Alphen振荡。观察到的振荡频率与计算出的费米表面的几何形状非常一致。振荡幅度的温度依赖性显示有效质量m〜*(α)= 0.71和m〜*(β)= 0.99 m_e,它们在计算出的带质量上提高了λ〜(cyc)为0.8。通过将测得的电子比热(γ= 11.5 mJ / mol K〜2)与能带结构计算的状态总密度进行比较,我们发现λ〜γ≈1有类似的增强。值得注意的是,已经报道了其他杀虫剂LaFe_2P_2,LaFePO(T_c≈4K)和LaRuPO的质量增加非常相似,而与它们是否超导无关。这与通常的看法相反,常态的准粒子重归一化反映了超导配对机制的强度,并引发了有关等结构化和等电子化的Ru和Fe锡超导体中配对的新问题。

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