1,720,998 research outputs found
MEDIA E POLITICA: IPOTESI DI UN COMPLOTTO Videopolitica e tecnopolitica: comunicazione e campagne elettorali
Full text linkANTONIO CAVICCHIA SCALAMONTI, MARIA IMMACOLATA MACIOTI, PINA LALL
Spectral density method for the damping of boson elementary excitations in one-dimensional spin S chain
No full textQuantum criticality of a d-dimensional spin S XXZ ferromagnetic model with longitudinal infinite-range interactions
No full textA d-dimensional spin-S XXZ ferromagnetic model with uniform long-range interactions in the z-direction is mapped into an effective XY model in a transverse field. Then, using the two-time Green function equation of motion method, the zero-temperature properties for a periodic cubic lattice are exactly obtained close to the quantum critical point signaling the field-induced quantum phase transition from the fully polarized state into a phase whith easy-plane spin ordering. We determine the relevant critical exponents which have a mean-field character for any d and S
Specific heat of quantum-spin chains: Application to (C6 H11 NH3)CuBr3 and (C6 H11 NH3)CuCl3
No full text
Thermodynamic functions of the S=1/2 one-dimensional ferromagnet via the renormalization-group approach and Green's function technique
No full text- …
