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Born effective charges and vibrational spectra in superconducting and bad conducting metals - Nature Physics
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Interactions mediated by electron–phonon coupling are responsible for important cooperative phenomena in metals such as superconductivity and charge density waves. The same interaction mechanisms produce strong collision rates in the normal phase of correlated metals, causing sizable reductions in d.c. conductivity and reflectivity. As a consequence, low-energy excitations like phonons, which are crucial for materials characterization, become visible in the optical infrared spectra.
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