Dynamical interplay between superconductivity and pseudogap in cuprates as revealed by terahertz third-harmonic generation spectroscopy
Jiayu Yuan,
Liyu Shi,
Li Yue
et al.
Abstract:We report on nonlinear terahertz third-harmonic generation (THG) measurements on YBa
2
Cu
3
O
6+
x
thin films. Different from conventional superconductors, the THG signal starts to appear in the normal state, which is consistent with the crossover temperature
T
* of pseudogap over broad doping levels. Upon lowering the temperature, the THG signal shows an anomaly just below
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