Evolution of the cyclotron mass with doping in La2−xSrxCuO4
Evolution of the cyclotron mass with doping in La2−xSrxCuO4
复制标题
La2·xSrxCuO4 掺杂后回旋加速器质量的演变
DOI：
10.1103/physrevb.106.195110
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发表时间：
2022
影响因子：
3.7
通讯作者：
Armitage, N. P.
中科院分区：
文献类型：
--
作者：
Legros, A.;Post, K. W.;Chauhan, Prashant;Rickel, D. G.;He, Xi;Xu, Xiaotao;Shi, Xiaoyan;Božović, Ivan;Crooker, S. A.;Armitage, N. P.
最近在强磁场下利用时域太赫兹光谱技术观察到的最佳掺杂的回旋共振现象为铜氧化物超导体的研究提供了新的可能性。人们可以测量具有短散射时间的更无序的铜氧化物中的回旋质量，因此将研究扩展到尚未观察到量子振荡的材料和掺杂。在这里，我们提出了测量的载流子质量的空穴掺杂铜跨越掺杂范围从轻微欠掺杂（）到高度过掺杂（），附近的超导圆顶的终端。这些结果揭示了一个系统的增加与掺杂，高达值大于13倍的裸电子质量。这是在相反的质量提取的热容，这表明一个峰值附近的pseudogap临界点和/或Lifshitz转变。的回旋频率是线性的字段高达31 T的所有掺杂，没有证据表明场诱导费米表面重建。回旋质量被发现是积极的所有掺杂，但与系统的热容质量下，最佳掺杂的样品，而超过它的过掺杂的样品的幅度低于。在其他方面，这些结果是令人惊讶的，因为光电发射揭示了我们的掺杂范围的中间的Lifshitz过渡和从有限频率共振确定的回旋质量的符号是，在传统的理论中，atopological quantityonly敏感的费米表面是否是封闭的空穴或电子。我们没有看到任何迹象的质量附近或附近的Lifshitz转变的发散，表明任何奇点，如果它存在，是不足以影响回旋质量。
The recent observation of cyclotron resonance in optimally dopedusing time-domain THz spectroscopy in high magnetic field has given new possibilities for the study of cuprate superconductors. One can measure the cyclotron mass in the more disordered cuprates possessing short scattering times, therefore expanding the study to materials and dopings in which quantum oscillations have not been observed. Here we present the measurement of the carrier mass of the hole-doped cuprateacross a range of dopings spanning from the slightly underdoped () to highly overdoped (), near the termination of the superconducting dome. These results reveal a systematic increase ofwith doping, up to values greater than 13 times the bare electron mass. This is in contrast with the masses extracted from the heat capacity, which show a peak near the pseudogap critical pointand/or Lifshitz transition. The cyclotron frequency is linear in field up to 31 T for all dopings, giving no evidence for field-induced Fermi surface reconstructions. The cyclotron mass is found to be positive for all dopings, but with a magnitude systematically below the heat-capacity mass for under and optimally doped samples, while exceeding it for overdoped samples. Among other aspects, these results are surprising as photoemission reveals a Lifshitz transition in the middle of our doping range and the sign of the cyclotron mass determined from a finite-frequency resonance is, in conventional theories, atopological quantityonly sensitive to whether or not the Fermi surface is closed around holes or electrons. We see no sign of a divergence of the mass nearnor near the Lifshitz transition, showing that any singularity, if it exists, is not strong enough to affect the cyclotron mass.