The spin-spiral waves and magnetic phase separation at finite temperatures
1 Physical-Technical Institute - Kirov Str. 132, Izhevsk 426000, Russia
Received: 14 March 2013
Accepted: 23 May 2013
The effect of temperature on the magnetic phase separation and the parameters of spin-spiral (helical) waves is studied using a two-dimensional single-band t-t’ Hubbard model. We obtained the dependence on the temperature of the parameters of helical magnetic phases and magnetic phase-separation (PS) regions. With an increase in temperature, the PS regions (AF + [Q,Q]), ([Q,Q] + [Q,π]) get substantially reduced but new PS [Q1,π] + [Q2,π], (AF + [Q,π]) arise. The results are used for the interpretation of the magnetic properties of cuprates.
PACS: 75.30.Kz – Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.) / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 75.10.Lp – Band and itinerant models
© EPLA, 2013