Crystal Structure and Spin Ordering in Quasi-Two-Dimensional Transition Metal Oxides with Honeycomb Geometry

Start Date
30-01-2020 08:00
End Date
30-01-2020 09:00
Room 500 - 501, Central Building
Speaker's name
Speaker's institute
Saint Petersburg State University, Russia
Contact name
Claudine Roméro
Host name
Alexei Bosak
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Low dimensional magnetism is one of the most fascinating and actively developing topics of modern solid state physics. The quantum essence of matter manifests itself most vividly in reduced dimension that gives rise to plenty of new interesting phenomena. The current work is aimed to study the features of long-range spin ordering at low temperatures in a number of new layered quasi-two-dimensional magnets with a honeycomb structure of magnetic layers formed by 3d metal atoms. The details of the crystal structure of all compounds were studied by means of neutron and synchrotron powder diffraction. Despite space group differences, all compounds have similar crystal structure: honeycomb layers of magnetic atoms are divided by nonmagnetic alkali atoms. The temperature evolution of the magnetic susceptibility, heat capacity, and neutron diffraction indicate antiferromagnetic long-range spin ordering at low temperatures. The spin structure was found to be sensitive to the crystal structure and its atomic composition.

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