Ryan Sinclair

Area of research

Condensed Matter Physics · Electronic, Optical and Magnetic Materials

Research interest

Research topics from publications: Noncollinear magnetic structure and magnetoelectric coupling in buckled honeycomb Co4Nb2O9: A single-crystal neutron diffraction study; Magnetic and structural phase transitions in the spinel compoundFe1+xCr2−x<mml:math xmlns:mml="http://; Magnetism and multiferroicity of an isosceles triangular lattice antiferromagnet Sr3NiNb2O9; Magnetic order and spin liquid behavior in [Mo3]11+ molecular magnets; Magnetic and electric properties of triangular lattice antiferromagnets Ba3ATa2O9 (A= Ni and Co); Naturally tuned quantum critical point in the S=1 kagomé YCa3(VO)3(BO</mm; Magnetic ground states and magnetodielectric effect inRCr(BO3)2(R=Ya. Representative work: Through an analysis of single-crystal neutron diffraction data, we present the magnetic structure and magnetoelectric properties of ${\mathrm{Co}}_{4}{\mathrm{Nb}}_{2}{\mathrm{O}}_{9}$ under various magnetic fields. In zero field, neutron diffraction experiments below ${T}_{N}=27\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ reveal that the ${\mathrm{Co}}^{2+}$ moments order in the (ab) plane without any spin canting along the $c$ axis, manifested by the magnetic symmetry $C2/{c}^{\ensuremath{'}}$. Along each Co chain parallel to the $c$ axis, the moments of nearest-neighbor Co atoms order ferromagnetically with a small cant away from the next-nearest-neighbor Co moments. Under the applied magnetic Neutron and x-ray diffraction, magnetic susceptibility, and specific heat measurements have been used to investigate the magnetic and structural phase transitions of the spinel system ${\mathrm{Fe}}_{1+x}$${\mathrm{Cr}}_{2\ensuremath{-}x}$${O}_{4}$ ($0.0$ $\ensuremath{\le}$ $x$ $\ensuremath{\le}$ $1.0$). The temperature versus Fe concentration ($x$) phase diagram features two magnetically ordered states and four structural states below 420 K. The complexity of the phase diagram is closely related to the change in the spin and orbital degrees of freedom induced by substitution of Fe ions for Cr ions. The systematic change in the crystal structure is explained by the combined effects of Jahn-T

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