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- W1665744025 abstract "Strong rf phonon echoes have been observed in the superconducting state of powders of high-${T}_{c}$ ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$. We suggest that the coupling mechanism between rf fields and acoustic modes is different from that in the usual phonon echoes judging from the sudden disappearance of the echoes at ${T}_{c}$=90 K and from the angular dependence of the echo intensity. The temperature dependence of ${T}_{2}^{mathrm{ensuremath{-}}1}$ is tentatively ascribed to the ultrasonic attenuation due to electrons, and the energy gap parameter 2ensuremath{Delta}/${k}_{B}$${T}_{c}$ is estimated to be 3--7." @default.
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- W1665744025 date "1989-04-01" @default.
- W1665744025 modified "2023-10-18" @default.
- W1665744025 title "Phonon echoes in powders of high-TcsuperconductingYBa2Cu3O7−δ" @default.
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- W1665744025 doi "https://doi.org/10.1103/physrevb.39.7351" @default.
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