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Catalogue of phonon modes in several cuprate high-temperature superconductors from density functional theory
N. J. Jabusch, P. Dayal, A. F. Kemper
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Cuprates are promising candidates for study in developing higher temperature superconductors. A thorough understanding of a material's phonon modes enables further investigation of its emergent properties, however, no complete reference of the phonon modes exists. Here, using density functional theory, we evaluate the phonon frequencies and atomic displacements for La₂CuO₄, Bi₂Sr₂CuO₆, and Bi₂Sr₂CaCu₂O₈ in their tetragonal structures. The phonon modes for all materials agree with those expected from space group symmetry and display instabilities corresponding to known low-temperature structural phase transitions.
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