Abstract
The paraelectric low-frequency dynamics of KH2PO 4-type crystals has been investigated on the basis of a new time-dependent pseudospin Hamiltonian which includes both long-range electrostatic interactions and strong short-range interactions which exist within clusters of four neighbouring bonds. The static limit of this model is the well-known four-particle cluster tunnelling Hamiltonian which gives a good account of the static properties of the first-order phase transition in these crystals. First-order time-dependent perturbation theory is used to calculate the dynamical linear response of the system.
Original language | English |
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Article number | 021 |
Pages (from-to) | 3135-3147 |
Number of pages | 13 |
Journal | Journal of Physics C: Solid State Physics |
Volume | 12 |
Issue number | 15 |
DOIs | |
State | Published - 1979 |
Externally published | Yes |