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Related Experiment Video

Updated: Jul 11, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe₁₊_YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Charge order superstructure with integer iron valence in Fe(2)OBO(3).

M Angst¹, P Khalifah, R P Hermann

¹Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. angst@ornl.gov

Physical Review Letters

|October 13, 2007

Summary

Iron oxyborate (Fe(2)OBO(3)) exhibits charge order around 340 K, confirmed by specific heat and spectroscopy. This ionic charge ordering in Fe(2)OBO(3) is the clearest example observed to date.

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Area of Science:

Solid-state chemistry
Materials science
Crystallography

Background:

Understanding charge ordering phenomena in transition metal oxides is crucial for developing advanced electronic materials.
Iron oxyborate (Fe(2)OBO(3)) is a material with potential for interesting electronic and magnetic properties.

Purpose of the Study:

To investigate the charge ordering behavior in single crystals of Fe(2)OBO(3).
To elucidate the structural and electronic characteristics associated with the charge ordered phase.

Main Methods:

Solution growth of Fe(2)OBO(3) single crystals.
Specific heat measurements to detect phase transitions.
Mössbauer spectroscopy for probing iron's electronic state.
X-ray diffraction for structural analysis and refinement.

Main Results:

A specific heat anomaly at 340 K signifies the onset of charge order.
X-ray diffraction revealed a doubling of the unit cell at low temperatures.
Combined analysis established diagonal charge order domains.
Bond-valence-sum analysis confirmed integer iron valence states in the ordered phase.

Conclusions:

Fe(2)OBO(3) presents the clearest example of ionic charge order observed to date.
The findings contribute to the fundamental understanding of charge ordering mechanisms in materials.
This study paves the way for exploring Fe(2)OBO(3) in potential electronic applications.