Infrared hall effect in high- T(c) superconductors: evidence for non-fermi-liquid hall scattering
Infrared hall effect in high- T(c) superconductors: evidence for non-fermi-liquid hall scattering
复制标题
高 T(c) 超导体中的红外霍尔效应：非费米液体霍尔散射的证据
作者：
Cerne;Grayson;Schmadel;Jenkins;Drew;Hughes;Dabkowski;Preston;Kung
用灵敏的偏振调制技术测量了高温超导体的红外（20-120和900-1100 cm（-1））法拉第旋转和圆二色性。研究了最佳掺杂YBa_2Cu_3 O_7薄膜在15<T<300 K温度范围内和8 T磁场下的生长。在1000 cm（-1）处，霍尔电导率σ（xy）随温度变化很大，而纵向电导率σ（xx）几乎与温度无关。霍尔散射率γ（H）具有T2温度依赖性，但与费米液体不同，它仅弱地依赖于频率。该实验对高温超导体正常状态下的输运理论提出了严格的限制。
Infrared ( 20-120 and 900-1100 cm(-1)) Faraday rotation and circular dichroism are measured in high- T(c) superconductors using sensitive polarization modulation techniques. Optimally doped YBa2Cu3O7 thin films are studied at temperatures in the range ( 15<T<300 K) and magnetic fields up to 8 T. At 1000 cm(-1) the Hall conductivity sigma(xy) varies strongly with temperature in contrast to the longitudinal conductivity sigma(xx) which is nearly independent of temperature. The Hall scattering rate gamma(H) has a T2 temperature dependence but, unlike a Fermi liquid, depends only weakly on frequency. The experiment puts severe constraints on theories of transport in the normal state of high- T(c) superconductors.