铜酸盐奇异金属中的磁热功率与粒子-空穴对称性
Magnetothermopower and particle-hole symmetry in a cuprate strange metal
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中文总结 AI 辅助
该研究通过对过掺杂Bi2201单晶的磁热功率测量，结合其他结果，发现其包含两个不同粒子-空穴对称性的输运部分，构建现象学实空间模型，协调了零场输运与反常磁热功率和磁阻，为过掺杂铜酸盐奇异金属性研究提供框架。
中文摘要 AI 辅助
我们报告了在高达35T磁场下对过掺杂的(Bi,Pb)2(Sr,La)2CuO6+δ（Bi2201）单晶进行的磁热功率测量。零场塞贝克系数S(T)的温度依赖性可用玻尔兹曼输运理论描述，但场依赖响应S(H)不行。磁热功率包含大量额外贡献，其场和温度依赖性与高于Tc的短程超导序一致。结合早期霍尔和磁阻结果，表明过掺杂铜酸盐奇异金属包含两个具有不同粒子-空穴对称性的输运部分。我们构建了一个现象学实空间模型，该模型协调了传统零场输运与反常磁热功率和磁阻，为思考过掺杂铜酸盐中的奇异金属性提供了具体框架。
英文摘要
Here, we report magnetothermopower measurements on overdoped (Bi,Pb)2(Sr,La)2CuO6+delta (Bi2201) single crystals in magnetic fields up to 35 T. Whereas the temperature dependence of the zero-field Seebeck coefficient S(T) can be captured using Boltzmann transport theory, the field-dependent response S(H) cannot. Instead, the magnetothermopower contains a large additional contribution whose field and temperature dependence is consistent with the presence of short-range superconducting order well above Tc. Combined with earlier Hall and magnetoresistance results, these data imply that the overdoped cuprate strange metal contains two transport sectors with distinct particle-hole symmetry: a conventional particle-hole-asymmetric Fermi-liquid (FL) contribution governing the Hall effect and the zero-field thermopower, and a nearly particle-hole-symmetric sector dominating the anomalous longitudinal magnetotransport. We formulate a phenomenological real-space model in which disconnected FL islands are embedded in a compensated Dirac liquid of phase-incoherent d-wave Bogoliubov quasiparticles. This picture reconciles conventional zero-field transport with anomalous magnetothermopower and magnetoresistance and offers a concrete framework for thinking about strange metallicity in overdoped cuprates.
