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/content/aip/journal/aplmater/3/6/10.1063/1.4922934
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/content/aip/journal/aplmater/3/6/10.1063/1.4922934
2015-06-24
2016-10-01

Abstract

High quality single crystals of BaFeO were grown using the floating zone technique in 100 atm of flowing oxygen. Single crystalneutron diffraction was used to determine the nuclear and magnetic structures of BaFeO at 4 K and 295 K. At both temperatures, there exist local electric dipoles formed by the off-mirror-plane displacements of magnetic Fe3+ions at the bipyramidal sites. The displacement at 4 K is about half of that at room temperature. The temperature dependence of the specific heat shows no anomaly associated with long range polar ordering in the temperature range from 1.90 to 300 K. The inverse dielectric permittivity, 1/ε, along the -axis shows a 2 temperature dependence between 10 K and 20 K, with a significantly reduced temperature dependence displayed below 10 K. Moreover, as the sample is cooled below 1.4 K there is an anomalous sharp upturn in 1/ε. These features resemble those of classic quantum paraelectrics such as SrTiO. The presence of the upturn in 1/ε indicates that BaFeO is a critical quantum paraelectric system with Fe3+ions involved in both magnetic and electric dipole formation.

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