Phonon squeezing in superconducting borocarbides
Date
1994
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Source Title
Physica C: Superconductivity and its applications
Print ISSN
0921-4534
Electronic ISSN
Publisher
Elsevier BV * North-Holland
Volume
234
Issue
1-2
Pages
167 - 172
Language
English
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Journal Title
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Abstract
The recently discovered superconductor LuNi2B2C is investigated in the context of strong electron-electron correlations modulated by a squeezed phonon mode propagating in the perpendicular direction to the layers with longitudinal polarization. The squeezed phonons arise in the anharmonic lattice expansion since the linear electron-phonon interaction vanishes due to the structure of the NiB4 tetrahedra. The observed weak isotope effect and small dependence of Tc on pressure is qualitatively understood within the framework of this model. © 1994.
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Keywords
Atoms , Boron compounds , Crystal structure , Intermetallics , Phase transitions , Phonons , Polarization , Pressure , Superconductivity , Anharmonic lattice expansion , Electron-electron correlation , Electronic band properties , Isotope effect , Squeezed phonon mode , Superconducting borocarbides , Superconducting materials