The high temperature Jahn-Teller transition in LaMn7O12

Details The high temperature Jahn-Teller transition in LaMn7O12 The high temperature Jahn-Teller transition in LaMn7O12

2009-05-10

arxiv.org/abs/0905.1500v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

A first order structural Jahn-Teller transition at T_{JT} = 650 K has been recently reported for the quadruple perovskite LaMn7O12 . We have carried out magnetization and transport measurements below and above T_{JT} in order to investigate the effect of the transition. Electrical conduction turns out to be polaronic, changing from non-adiabatic to adiabatic through the transition. Magnetic behavior can be described by non-interacting Mn3+ ions below T_{JT}, while above T_{JT} it is of questionable interpretation. The effect of thermal cycling on as grown samples of different purity degree also allowed us to clarify the intrinsic magnetic response of LaMn7O12 at lower temperatures.

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