Photo-induced new metastable state with modulated Josephson coupling strengths in Pr$_{0.88}$LaCe$_{0.12}$CuO$_4
Phys. Rev. B 98, 224507 (2018) Photoexcitations on a superconductor using ultrafast nir-infrared (NIR) pulses, whose energy is much higher than the superconducting energy gap, are expected to suppress/destroy superconductivity by breaking Cooper pairs and excite quasiparticles from occupied state to...
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Main Authors | , , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
24.06.2018
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Subjects | |
Online Access | Get full text |
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Summary: | Phys. Rev. B 98, 224507 (2018) Photoexcitations on a superconductor using ultrafast nir-infrared (NIR)
pulses, whose energy is much higher than the superconducting energy gap, are
expected to suppress/destroy superconductivity by breaking Cooper pairs and
excite quasiparticles from occupied state to unoccupied state far above the
Fermi level. This appears to be true only for small pumping fluence. Here we
show that the intense NIR pumping has different effect. We perform an intense
NIR pump, c-axis terahertz probe measurement on an electron-doped cuprate
superconductor Pr$_{0.88}$LaCe$_{0.12}$CuO$_4$ with T$_c$=22 K. The measurement
indicates that, instead of destroying superconductivity or exciting
quasiparticles, the intense NIR pump drives the system from an equilibrium
superconducting state with uniform Josephson coupling strength to a new
metastable superconducting phase with modulated Josephson coupling strengths
below T$_c$. |
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DOI: | 10.48550/arxiv.1806.09140 |