Electron-lattice interaction in Sm1-xYxS-like systems

✍ Scribed by Miguel Kiwi; Miguel Rivas; Jaime Rössler

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 593 KB
• Volume: 171
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(91)90496-2

✦ Synopsis

An Anderson-like Hamiltonian, which describes a cluster of a rare earth (Sm or Y) cation surrounded by six S anions, is used to model the electron-lattice interaction in mixed-valence systems. Coupling between the electronic and phononic variables is introduced, and two different phonon modes are considered: a breathing and a&asymmetric one. The first, related to the ionic radius, is treated exactly. The asymmetric mode, which determines the sd-f hybridization, is dealt with in the Born-Oppenheimer approximation. Experimental results are adequately accounted for by this simple model.