%0 Journal Article
%A Flesch, A.
%A Zhang, G.
%A Koch, E.
%A Pavarini, E.
%T Orbital-order melting in rare-earth manganites: Role of superexchange
%J Physical review / B
%V 85
%N 3
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-22914
%P 035124
%D 2012
%Z We thank I. Loa and K. Syassen for sharing unpublished data. Calculations were done on the Julich Blue Gene/P and Juropa. We acknowledge financial support from the Deutsche Forschungsgemeinschaft through research unit FOR1346.
%X We study the mechanism of orbital-order melting observed at temperature T-OO in the series of rare-earth manganites. We find that the purely electronic many-body super-exchange mechanism yields a transition temperature T-KK that decreases with decreasing rare-earth radius and increases with pressure, opposite to the experimental T-OO. We show that the tetragonal crystal-field splitting reduces T-KK further increasing the discrepancies with experiments. This proves that super-exchange effects, although very efficient, in the light of experimentally observed trends play a minor role for the melting of orbital ordering in rare-earth manganites.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000299871800003
%R 10.1103/PhysRevB.85.035124
%U https://juser.fz-juelich.de/record/22914