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- W4366999344 abstract "Exploring the origin of the pseudogap is important for the understanding of superconductivity in cuprates. Here we report a systematical experimental study on the phonon vibrational properties of Tl$_2$Ba$_2$Ca$_{n-1}$Cu$_n$O$_{2n+4+delta}$ ($n$=1,2,3) single crystals based on the Raman scattering measurements over the temperature range from 10 to 300 K. The temperature evolution of the frequency and linewidth of the observed phonon modes in each member of this family does not follow the expected self-energy effect when entering the superconducting state. Instead, these phonon modes exhibit a universal softening behavior below the temperature around 150 K, which is higher above the superconducting transition. From the comparison with the existing experimental data for various orders, we find that the observed starting temperature for the phonon softening corresponds to the onset opening temperature of the pseudogap. This finding indicates a large lattice effect in the pseudogap state and the non-negligible spin-phonon coupling for such a phonon softening." @default.
- W4366999344 created "2023-04-27" @default.
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- W4366999344 date "2023-04-21" @default.
- W4366999344 modified "2023-10-18" @default.
- W4366999344 title "Universal phonon softening in the pseudogap state of Tl$_2$Ba$_2$Ca$_{n-1}$Cu$_n$O$_{2n+4+delta}$" @default.
- W4366999344 doi "https://doi.org/10.48550/arxiv.2304.11305" @default.
- W4366999344 hasPublicationYear "2023" @default.
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