Non-adiabatic small polaron hopping in the n=3 Ruddlesden-Popper compound Ca4Mn3O10

Details Non-adiabatic small polaron hopping in the n=3 Ruddlesden-Popper compound Ca4Mn3O10 Non-adiabatic small polaron hopping in the n=3 Ruddlesden-Popper compound Ca4Mn3O10

2003-05-18

arxiv.org/abs/cond-mat/0305421v1

Physics

Condensed Matter

Materials Science

29 pages, 7 figures

Scientific paper

10.1088/0953-8984/15/40/018

Magnetotransport properties of the compound Ca4Mn3O10 are interpreted in terms of activated hopping of small magnetic polarons in the non-adiabatic regime. Polarons are most likely formed around Mn3+ sites created by oxygen substoichiometry. The application of an external field reduces the size of the magnetic contribution to the hopping barrier and thus produces an increase in the conductivity .We argue that the change in the effective activation energy around TN is due to the crossover to VRH conduction as antiferromagnetic order sets in.

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