Abstract
The neutron-weighted phonon density of states in the high-temperature superconductor Tl 2CaBa 2Cu 2O 8 ( T c=107 K) is obtained from coherent inelastic neutron scattering measurements at the Dhruva reactor at 300 K. The phonon spectrum is qualitatively similar to that in the 90 K superconductor YBa 2Cu 3O 7, and compares well with an independent lattice dynamical calculation.
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