Very weak electron-phonon coupling and strong strain coupling in manganites
نویسندگان
چکیده
S. Cox,1,2 J. C. Loudon,2 A. J. Williams,3 J. P. Attfield,3 J. Singleton,1 P. A. Midgley,2 and N. D. Mathur2 1National High Magnetic Field Laboratory, Ms-E536, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 2Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom 3Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom Received 29 November 2007; published 28 July 2008
منابع مشابه
Ferromagnetism and Transport in the Double-Exchange Model, with and without Phonons; Application to the Manganites
An introduction is given to the many-body coherent potential approximation (CPA) for the double-exchange (DE) model and the Holstein-DE model, the latter including coupling of the electrons to local phonons as well as to the local spins. It is shown how the method can treat the local spins and phonons quantum-mechanically and how it is equivalent to dynamical mean field theory in the classical ...
متن کاملEnhanced Strain Coupling of Nitrogen-Vacancy Spins to Nanoscale Diamond Cantilevers
Nitrogen-vacancy (NV) centers can couple to confined phonons in diamond mechanical resonators via the effect of lattice strain on their energy levels. Access to the strong spin-phonon coupling regime with this system requires resonators with nanoscale dimensions in order to overcome the weak strain response of the NV ground-state spin sublevels. In this work, we incorporate photostable NVs in d...
متن کاملDYNAMICAL PAIRING CORRELATIONS IN THE t–J MODEL WITH NON–ADIABATIC HOLE–PHONON COUPLING
The interplay of electronic and lattice degrees of freedom in strongly electron– correlated systems is now attracting a lot of attention. This interest is partially due to the prominent role of the electron–phonon (EP) interaction in several transition metal oxides with strong Coulomb correlations, such as the colossal magnetoresistive manganites or the charge–ordered (insulating) nickelates. F...
متن کاملMagnon damping by magnon-phonon coupling in manganese perovskites
Inelastic neutron scattering was used to systematically investigate the spin-wave excitations ~magnons! in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures (TC’s! of different manganites, their low-temperature spin waves have very similar dispersions with the zone-boundary magnon softening and broadening that cannot be explained by the canonical d...
متن کاملun 2 00 7 Optical conductivity of polaronic charge carriers
The optical conductivity of charge carriers coupled to quantum phonons is studied in the framework of the one-dimensional spinless Holstein model. For one electron, variational diagonalisation yields exact results in the thermodynamic limit, whereas at finite carrier density analytical approximations based on previous work on single-particle spectral functions are obtained. Particular emphasis ...
متن کامل