AI 中文总结
该研究通过磁输运实验探究两类铋系铜氧化物单晶，证实赝能隙起始温度与超导涨落存在明显区别，表明赝能隙并非源于超导涨落，可能来自BCS-BEC渡越区的预形成库珀对。
AI 中文摘要
理解正常态对揭示高$T_c$超导机制至关重要。我们研究了宽掺杂范围的Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$和Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$单晶的磁输运特性。尽管面内电阻率和霍尔系数表现出强烈的赝能隙诱导的温度依赖关系，但$T^2$霍尔角行为和修正的科勒（Kohler）定则在所有掺杂下均保持稳健。赝能隙的起始温度与超导涨落明显不同，不过二者与赝能隙幅值的标度关系符合$d$波超导体的系数。这些结果表明赝能隙并非源于超导涨落，反而提示其可能起源于BCS-BEC渡越区中的预形成库珀对。
英文摘要
Understanding the normal state is essential for uncovering the mechanism of high-$T_c$ superconductivity. We investigate magnetotransport in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ and Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$ single crystals over a wide doping range. While the in-plane resistivity and Hall coefficient show strong pseudogap-induced temperature dependence, the $T^2$ Hall-angle behavior and the modified Kohler's rule remain robust across all dopings. The onset temperatures of the pseudogap are clearly distinct from superconducting fluctuations, although they scale with the pseudogap magnitudes with a factor consistent with a $d$-wave superconductor. These results demonstrate that the pseudogap does not arise from superconducting fluctuations and instead suggest that it may originate from preformed Cooper pairing in the BCS-BEC crossover regime.
Comments7 pages 4 figures in the main manuscript; 9 pages 9 figures in the Supplemental Material
