AI 中文总结
该研究通过测量La3Ni2O7单晶的电阻率构建压力-温度相图，揭示压力调控密度波序改变各向异性输运，形成含普朗克耗散的奇异金属态并诱导超导电性。
AI 中文摘要
压力诱导双层镍酸盐的超导电性为研究非常规超导体中电荷/自旋序与电输运的交织作用提供了平台。然而，由于缺乏对大尺寸单晶的精确测量，输运相关的重要定量信息，如电阻率绝对值、各向异性及载流子散射率仍不足。本文通过测量高质量La3Ni2O7单晶的面内与面外电阻率，构建了高精度的压力-温度相图。我们分辨出两个具有不同压力依赖的、与密度波形成相关的异常。压力诱导的结构转变不仅增强了两个方向的电阻率值，还提升了低温下的电阻率各向异性，证明了密度波序对电荷动力学的显著影响。零电阻超导电性出现在密度波相被完全抑制的边界附近，且在Tc以上，电阻率在宽温度范围内呈现温度线性依赖，散射率处于普朗克极限范围内。我们的结果表明，压力通过调控密度波序显著改变各向异性电荷输运，最终产生具有强散射的显著奇异金属态，超导电性由此产生。这确立了强密度波关联与普朗克耗散是La3Ni2O7的显著特征。
英文摘要
Pressure-induced superconductivity in bilayer nickelates provides a platform for investigating intertwined roles of charge/spin orders and electric transport in unconventional superconductivity. However, important quantitative information on the transport, such as the absolute value of the resistivity, the anisotropy, and the scattering rate of carriers, remains insufficient due to the lack of accurate measurements using large single crystals. Here we establish a high-precision pressure-temperature phase diagram of high-quality La3Ni2O7 single crystals, by measuring the in-plane and out-of-plane resistivities. We resolve two distinct anomalies associated with density-wave formation with contrasting pressure dependences. The pressure-induced structural transition enhances not only the resistivity values for both directions, but also its anisotropy at low temperatures, demonstrating a pronounced effect of density-wave order on the charge dynamics. Superconductivity with zero-resistance emerges near the boundary where the density-wave phases are fully suppressed, and above Tc, the resistivity exhibits a temperature-linear dependence over a wide temperature range while the scattering rate falls within a regime of the Planckian limit. Our results show that pressure dramatically changes the anisotropic charge transport via modifying density-wave orders, and eventually produces a pronounced strange-metal state with strong scatterings, from which superconductivity develops. This establishes robust density-wave correlations and Planckian dissipation as remarkable features of La3Ni2O7.
Comments44 pages, 4 figures, 9 extended data, 5 supplementary data, 4 supplementary tables
