Phonon calculations find avoided crossings that reduce low-T specific heat and entropy in bulk SnO/PbO and monolayer SnO, but monolayer PbO lacks the crossing and shows higher values due to mass difference and missing interlayer interactions.
Kokalj, Journal of Molecular Graphics and Modelling, 1999, 17, 176-9
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Vibrational Spectra of MO (M=Sn/Pb) in Their Bulk and Single Layer Forms: Role of Avoided Crossing in their Thermodynamic Properties
Phonon calculations find avoided crossings that reduce low-T specific heat and entropy in bulk SnO/PbO and monolayer SnO, but monolayer PbO lacks the crossing and shows higher values due to mass difference and missing interlayer interactions.