Dielectric signature of charge order in lanthanum nickelates

Details Dielectric signature of charge order in lanthanum nickelates Dielectric signature of charge order in lanthanum nickelates

2012-03-02

arxiv.org/abs/1203.0414v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures

Scientific paper

Three charge-ordering lanthanum nickelates La2-xAxNiO4, substituted with specific amounts of A = Sr, Ca, and Ba to achieve commensurate charge order, are investigated using broadband dielectric spectroscopy up to GHz frequencies. The transition temperatures of the samples are characterized by additional specific heat and magnetic susceptibility measurements. We find colossal magnitudes of the dielectric constant for all three compounds and strong relaxation features, which partly are of Maxwell-Wagner type arising from electrode polarization. Quite unexpectedly, the temperature-dependent colossal dielectric constants of these materials exhibit distinct anomalies at the charge-order transitions.

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