Temperature effects in a spin-orbital model for manganites

Abstract

We study a two-dimensional effective orbital superexchange model derived for strongly correlated e_g electrons coupled to t_{2g} core spins in layered manganites. One finds that the ferromagnetic and antiferromagnetic correlations closely compete, and small changes of parameters can switch the type of magnetic order. For the same reason, spin order is easily destroyed with rising temperature, while alternating orbital correlations can persist to temperatures where FM order has already melted. A scenario for the AF phase observed in LaSrMnO_4 is presented.

arXiv comment4 pages, 3 figures, contribution to the PM05-meeting in Poznan, Poland

References in corpus (6)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Phase Separation in Electronic Models for Manganites
• Electronic origin of magnetic and orbital ordering in insulating LaMnO_3
• Crystal and magnetic structure of La_{1-x}Sr_{1+x}MnO_{4} : role of the orbital degree of freedom
• Orbital polarons versus itinerant e_g electrons in doped manganites
• Uniform hopping approach to the FM Kondo Model at finite temperature

Cited by in corpus (5)

• Fingerprints of spin-orbital entanglement in transition metal oxides
• Spectral properties of orbital polarons in Mott insulators
• Doping dependence of spin and orbital correlations in layered manganites
• Mott-Hubbard versus charge-transfer behavior in LaSrMnO4 studied via optical conductivity
• Theory for charge and orbital density-wave states in manganite La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$