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The Japan Society of Applied Physics

Study on line width and space dependence of YBa 2 Cu 3 O 7-δ based MKIDs

Hikaru Mikami, Kangi Hayashi, Takeshi Hizawa, Kensuke Nakajima, Saburo Tanaka, Seiichiro Ariyoshi

Published Jan 28, 2020• 0 citations
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Time-resolved measurements of quasiparticle (QP) relaxation dynamics on the femtosecond timescale are reported as a function of temperature and doping in YBa 2 Cu 3 O 7 − δ for (0.48 < δ < 0.1). In the underdoped state (δ > 0.15), there is no evidence for any changes in the low-energy gap structure at T c from either photoinduced QP absorption or QP relaxation time data. In combination with the sum rule, this implies the existence of pre-formed pairs up to a much higher temperature T *. Near δ = 0.1 a rapid cross-over is observed, to a state where the QP recombination time diverges and the photoinduced QP density falls to zero at T c , indicating the existence of a temperature-dependent superconducting gap which closes at T c .

arXiv:cond-mat/9812079•Europhysics Letters (EPL)•Feb 1, 1999•22 citations
The high-frequency response of bicrystal YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// Josephson junctions for far infrared laser irradiation is presented. The junctions on silicon and MgO substrates exhibit a remarkable first order Shapiro step for the methanol line at 1.76 THz. dV/dI measurements reveal several steps corresponding to the methanol lines at 1.48, 1.76 and 2.53 THz. The line width of Josephson oscillation at these frequencies is estimated from the width of the Shapiro steps. It is suggested that the excess shot noise broadens the line width.
Time-resolved measurements of quasiparticle (QP) relaxation dynamics on the femtosecond timescale are reported as a function of temperature and doping in YBa 2 Cu 3 O 7 − δ for (0.48 < δ < 0.1). In the underdoped state (δ > 0.15), there is no evidence for any changes in the low-energy gap structure at T c from either photoinduced QP absorption or QP relaxation time data. In combination with the sum rule, this implies the existence of pre-formed pairs up to a much higher temperature T *. Near δ = 0.1 a rapid cross-over is observed, to a state where the QP recombination time diverges and the photoinduced QP density falls to zero at T c , indicating the existence of a temperature-dependent superconducting gap which closes at T c .