TY  - JOUR
AU  - Flesch, A.
AU  - Zhang, G.
AU  - Koch, E.
AU  - Pavarini, E.
TI  - Orbital-order melting in rare-earth manganites: Role of superexchange
JO  - Physical review / B
VL  - 85
IS  - 3
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-22914
SP  - 035124
PY  - 2012
N1  - We thank I. Loa and K. Syassen for sharing unpublished data.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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000299871800003
DO  - DOI:10.1103/PhysRevB.85.035124
UR  - https://juser.fz-juelich.de/record/22914
ER  -