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- W2102637913 abstract "We report far-infrared and Raman studies of several ceramic superconducting cuprate perovskites MBa2Cu3O7 with M=Nd, Dy, Er, Tm. Systematic studies of the phonon-related peaks show that the frequencies of optical phonons related to vibrations of M atoms decrease slightly with increasing atomic number of the rare earth, thus confirming the trend observed earlier for M=Y, Sm, Eu, Gd, Ho. The temperature dependence of phonon features exhibits an anomalous behavior for the optical phonons at ∼310 cm−1 and 280 cm−1. Such anomalous temperature dependence of phonons attributed to the bond bending vibrations of Cu2O2 and Cu2O3 bonds, seems to be a universal property of all superconducting cuprates. Possible origins of the phonons softening and the systematics of the variation of phonon frequencies with the ionic radius of M are discussed." @default.
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- W2102637913 date "1988-01-01" @default.
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- W2102637913 title "Infrared and Raman spectra of the new superconducting cuprate perovskites MBa2Cu3O7, M =Nd, Dy, Er, Tm" @default.
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- W2102637913 doi "https://doi.org/10.1016/0038-1098(88)90591-1" @default.
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