Abstract
AbstractThe multielectron operators (MEO) method is used for calculating the collective excitations of unfilled shells in transition ions. The excitation dispersion law depends on a chemical bond. Decrease of the lattice stability with increasing T is determined by the MEO correlation function of the neighbour sites (the order parameter). The conduction electron scattering on such excitations provides a contribution to the electrical resistance ϱ(T) ∼ T2 in a parabolical dispersion law approximation. The effective Hamiltonian is obtained of the Cooper pairing which energy is large enough for interaction of the conduction electrons with the nearest neighbour ions. The pairing mechanism is attenuated for antiferromagnetic spin ordering of the neighbour sites. The elastic moduli defect, determining a kink of the phonon contribution to ϱ(T) near Tc or TN, is taken into account, comparing the theory with the experimental curves ϱ(T).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.