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Effect of pressure on the pseudogap and charge density wave phases of the cuprate Nd-LSCO probed by thermopower measurements
Physical Review Research ( IF 3.5 ) Pub Date : 2021-04-22 , DOI: 10.1103/physrevresearch.3.023066 A. Gourgout , A. Ataei , M.-E. Boulanger , S. Badoux , S. Thériault , D. Graf , J.-S. Zhou , S. Pyon , T. Takayama , H. Takagi , Nicolas Doiron-Leyraud , Louis Taillefer
Physical Review Research ( IF 3.5 ) Pub Date : 2021-04-22 , DOI: 10.1103/physrevresearch.3.023066 A. Gourgout , A. Ataei , M.-E. Boulanger , S. Badoux , S. Thériault , D. Graf , J.-S. Zhou , S. Pyon , T. Takayama , H. Takagi , Nicolas Doiron-Leyraud , Louis Taillefer
We report thermopower measurements under hydrostatic pressure on the cuprate superconductor (Nd-LSCO), at low temperature in the normal state accessed by suppressing superconductivity with a magnetic field up to . Using an ac thermopower measurement technique suitable for high pressure and high field, we track the pressure evolution of the Seebeck coefficient . At ambient pressure and low temperature, in Nd-LSCO was recently found to suddenly increase below the pseudogap critical doping , consistent with a drop in carrier density from above to below. Under a pressure of 2.0 GPa, we observe that the large value just below is suppressed. This confirms a previous pressure study based on electrical resistivity and Hall effect, which found that pressure lowers , thereby reinforcing the interpretation that this effect is driven by the pressure-induced shift of the van Hove point. It implies that the pseudogap only exists when the Fermi surface is hole-like, which puts strong constraints on theories of the pseudogap phase. We also report thermopower measurements on Nd-LSCO and in the charge density wave phase near , which reveals a weakening of this phase under pressure.
中文翻译:
压力对热功率测量探测的铜酸盐Nd-LSCO伪间隙和电荷密度波相位的影响
我们报告了铜酸盐超导体在静水压力下的热功率测量结果 (Nd-LSCO),在常温下处于低温状态,通过抑制超导电性而获得,磁场强度最高可达 。使用适用于高压和高场的交流热电测量技术,我们跟踪塞贝克系数的压力演变。在环境压力和低温下, 最近发现Nd-LSCO中的Nb突然增加到伪间隙临界掺杂以下 ,与载流子密度的下降相一致 从 以上 至 以下。在2.0 GPa的压力下,我们观察到 值刚好低于 被抑制。这证实了先前基于电阻率和霍尔效应进行的压力研究,发现压力降低了,从而加强了这种影响是由压力引起的范霍夫点偏移引起的解释。这意味着伪间隙仅在费米表面为孔状时才存在,这对伪间隙相的理论施加了严格的约束。我们还报告了Nd-LSCO和 在电荷密度波相附近 ,这表明该阶段在压力下会减弱。
更新日期:2021-04-22
中文翻译:
压力对热功率测量探测的铜酸盐Nd-LSCO伪间隙和电荷密度波相位的影响
我们报告了铜酸盐超导体在静水压力下的热功率测量结果 (Nd-LSCO),在常温下处于低温状态,通过抑制超导电性而获得,磁场强度最高可达 。使用适用于高压和高场的交流热电测量技术,我们跟踪塞贝克系数的压力演变。在环境压力和低温下, 最近发现Nd-LSCO中的Nb突然增加到伪间隙临界掺杂以下 ,与载流子密度的下降相一致 从 以上 至 以下。在2.0 GPa的压力下,我们观察到 值刚好低于 被抑制。这证实了先前基于电阻率和霍尔效应进行的压力研究,发现压力降低了,从而加强了这种影响是由压力引起的范霍夫点偏移引起的解释。这意味着伪间隙仅在费米表面为孔状时才存在,这对伪间隙相的理论施加了严格的约束。我们还报告了Nd-LSCO和 在电荷密度波相附近 ,这表明该阶段在压力下会减弱。