Publications (8)
Coexistence and interaction of spinons and magnons in an antiferromagnet with alternating antiferromagnetic and ferromagnetic quantum spin chains
H. Zhang, Z. Zhao, D. Gautreau +10
In conventional quasi-one-dimensional antiferromagnets with quantum spins, magnetic excitations are carried by either magnons or spinons in different energy regimes: they do not co…
Mean-field phase diagram of interacting e_g electrons
M. Raczkowski, A. M. Oles, R. Fresard
We investigate the magnetic phase diagram of the two-dimensional model for e_g electrons which describes layered nickelates. One finds a generic tendency towards magnetic order acc…
Phonons and the coherence scale of models of heavy fermions
M. Raczkowski, P. Zhang, F. F. Assaad +2
We consider models of heavy fermions in the strong coupling or local moment limit and include phonon degrees of freedom on the conduction electrons. Due to the large mass or low co…
Interplay of orbitally polarized and magnetically ordered phases in doped transition metal oxides
R. Fresard, M. Raczkowski, A. M. Oles
We investigate the magnetic instabilities of the two-dimensional model of interacting e_g electrons for hole doping away from two electrons per site in the mean-field approximation…
Spin stiffness and quantum fluctuations in C-type and A-type antiferromagnets
M. Raczkowski, A. M. Oles
We present a systematic study of quantum fluctuations in the C-type and A-type antiferromagnetic (AF) phases in cubic lattices and in bilayer systems. Using the linear spin-wave th…
Vertical and Diagonal Stripes in the Extended Hubbard Model
M. Raczkowski, B. Normand, A. M. Oles
We extend previous real-space Hartree-Fock studies of static stripe stability to determine the phase diagram of the Hubbard model with anisotropic nearest-neighbor hopping t, by va…