H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK.
Philos Trans A Math Phys Eng Sci. 2011 Apr 28;369(1941):1626-39. doi: 10.1098/rsta.2010.0196.
From analysis of the in-plane resistivity ρ(ab)(T) of La(2-x)Sr(x)CuO(4), we show that normal state transport in overdoped cuprates can be delineated into two regimes in which the electrical resistivity varies approximately linearly with temperature. In the low-temperature limit, the T-linear resistivity extends over a very wide doping range, in marked contrast to expectations from conventional quantum critical scenarios. The coefficient of this T-linear resistivity scales with the superconducting transition temperature T(c), implying that the interaction causing this anomalous scattering is also associated with the superconducting pairing mechanism. At high temperatures, the coefficient of the T-linear resistivity is essentially doping independent beyond a critical doping p(crit)=0.19 at which the ratio of the two coefficients is maximal. Taking our cue from earlier thermodynamic and photoemission measurements, we conclude that the opening of the normal-state pseudogap at p(crit) is driven by the loss of coherence of anti-nodal quasi-particles at low temperatures.
从 La(2-x)Sr(x)CuO(4) 的面内电阻率 ρ(ab)(T)分析表明，过掺杂 cuprates 的正常态输运可以划分为两个区域，其中电阻率随温度近似线性变化。在低温极限下，T 线性电阻率在非常宽的掺杂范围内延伸，与传统量子临界情景的预期形成鲜明对比。这个 T 线性电阻率的系数与超导转变温度 T(c)成正比，这意味着导致这种反常散射的相互作用也与超导配对机制有关。在高温下，T 线性电阻率的系数在一个临界掺杂 p(crit)=0.19 之后基本上与掺杂无关，在这个掺杂值处两个系数的比值最大。根据早期的热力学和光电子能谱测量结果，我们得出结论，在 p(crit)处打开正常态赝能隙是由低温下反节点准粒子相干性的丧失驱动的。
