Anomalous normal-state resistivity in superconducting La2−xCexCuO4 : Fermi liquid or strange metal?
Anomalous normal-state resistivity in superconducting La2−xCexCuO4 : Fermi liquid or strange metal?
复制标题
超导 La2·xCexCuO4 中的反常常态电阻率：费米液体还是奇怪的金属？
DOI：
10.1103/physrevb.98.224503
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发表时间：
2018
影响因子：
3.7
通讯作者：
Das Sarma, S.
中科院分区：
文献类型：
--
作者：
Sarkar, Tarapada;Greene, Richard L.;Das Sarma, S.
我们给出了电子掺杂的铜酸盐超导体在其转变温度以上的面内电阻率随Ce掺杂和温度变化的实验结果。在0.11~0.17之间，在30K~5K之间，我们发现，在70~250K的测量范围内，所有掺杂量的电阻率都表现出良好的行为，其电阻率项系数随温度的升高而减小。我们从理论上分析了我们的数据，并假设类型的铜酸盐更适合被认为是奇怪的金属。虽然二次温度依赖关系似乎与费米液体(FL)的预期天真地一致，但测量的电阻率很大，并且在高达400K时近似散射主导着电阻率的事实与标准的正常金属FL图的适用相抵触。我们讨论了奇怪金属行为的可能来源。
We present experimental results for the in-plane resistivity of the electron-doped cuprate superconductorabove its transition temperatureas a function of Ce dopingand temperature. For the dopingbetween 0.11 and 0.17, wherevaries from 30 K () to 5 K (), we find that the resistivity shows abehavior for all values of doping over the measurement range from 70 to 250 K. The coefficient of theresistivity term decreases with increasingfollowing the trend in. We analyze our data theoretically and posit that-type cuprates are better thought of as strange metals. Although the quadratic temperature dependence appears to be in naive agreement with the Fermi-liquid (FL) expectations, the facts that the measured resistivity is large and approximatescattering dominates the resistivity even up to 400 K argue against a standard normal-metal FL picture being applicable. We discuss possible origins of the strange-metal behavior.