Incommensurate Charge Order Phase in Fe2OBO3 due to Geometrical Frustration
M. Angst, R.P. Hermann, W. Schweika, J.-W. Kim, P. Khalifah, H.J., Xiang, M.-H. Whangbo, D.-H. Kim, B.C. Sales, and D. Mandrus
TL;DR
This study investigates the charge order in Fe2OBO3, revealing an intermediate incommensurate phase caused by geometrical frustration, with temperature-dependent modulations and coexistence of mobile and immobile carriers.
Contribution
It uncovers the incommensurate charge order phase in Fe2OBO3 and links it to geometrical frustration and anti-phase boundaries.
Findings
Identification of an intermediate incommensurate phase between room temperature and 340 K.
Observation of temperature-dependent incommensurate superstructure modulations.
Coexistence of mobile and immobile charge carriers in the intermediate phase.
Abstract
The temperature dependence of charge order in Fe2OBO3 was investigated by resistivity and differential scanning calorimetry measurements, Mossbauer spectroscopy, and synchrotron x-ray scattering, revealing an intermediate phase between room temperature and 340 K, characterized by coexisting mobile and immobile carriers, and by incommensurate superstructure modulations with temperature-dependent propagation vector (1/2,0,tau). The incommensurate modulations arise from specific anti-phase boundaries with low energy cost due to geometrical charge frustration.
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