9 papers
Bose-Einstein condensation of magnons
M. Crisan, D. Bodea, I. Tifrea +1
We use the Renormalization Group method to study the Bose-Einstein condensation of the interacting dilute magnons which appears in three dimensional spin systems in magnetic field.…
Non-Fermi liquid behavior of the electrical resistivity at the ferromagnetic quantum critical point
D. Bodea, M. Crisan, I. Grosu +1
We propose a model for the non-Fermi behavior in the proximity of the quantum phase transition induced by the strong polarization of the electrons due to local magnetic moments. Th…
Finite - temperature quantum phase transition in d - waves superconductors
M. Crisan, D. Bodea, I. Grosu +1
The zero temperature d - wave superconductor phase transition theory given in the case of T=0 for two - dimensional superconductors (I. Herbut, PRL {\bf 85}, 1532 (2000)) is genera…
Specific heat of a Fermi system near ferromagnetic quantum phase transition
I. Grosu, D. Bodea, M. Crisan
We calculate the specific heat for an interacting Fermi system near the ferromagnetic phase transition using the Renormalization Group method. The temperature dependence of the spe…
Field-Theoretical description of the crossover between BCS and BEC in a non-Fermi superconductor
C. P. Moca, I. Tifrea, M. Crisan
Using the field-theoretical methods we studied the evolution from BCS description of a non-Fermi superconductor to that of Bose-Einstein condensation (BEC) in one loop approximatio…
Non-Fermi behavior of the disorder electronic system
C. P. Moca, I. Tifrea, M. Crisan
We showed that an electronic system with weak disorder considered in the finite-charge infinite U Hubbard model can present a non-Fermi behavior. The imaginary pert of the self-ene…