Light-induced new collective modes in the superconductor La1.905Ba0.095CuO4

Article

关键词: LOW-ENERGY EXCITATIONS;    DENSITY-WAVE;    PHASE;    CUPRATE;    STATE;    LA1.87SR0.13CUO4;    MANGANITE;   

DOI  :  10.1103/PhysRevB.98.020506

来源: SCIE

【 摘 要 】

We report near and midinfrared pump, c-axis terahertz probe measurements on a superconducting single crystal La1.905Ba0.095CuO4 with T-c = 32 K. The measurements reveal that the pump-induced change occurs predominantly at the Josephson plasma edge position below T-c. Upon excitation by strong near-infrared pulses, the superconducting state is severely disturbed and incoherent quasiparticle excitations develop in the frequency regime above the static plasma edge. However, within a very short time delay (similar to 1.5 ps) we observe the reappearance of a very sharp Josephson plasma edge at a frequency lower than the static Josephson plasma edge and the emergence of a new light-induced edge at a higher energy. The results imply that the light can induce new Josephson plasmon modes with different coupling strengths. A similar but weaker effect is observed for the midinfrared pump. No pump-induced effect is detected above T-c.

【 授权许可】

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