Aikaterini Flessa

Area of research

Atomic and Molecular Physics, and Optics · Condensed Matter Physics

Research interest

Research topics from publications: Diverse magnetic phase diagram and anomalous Hall effect in antiferromagnetic LuMn6Sn6; Electrical transport and torque magnetometry studies of the kagome compound LuV6Sn6 under high magnetic fields; Giant magnetoresistance in the crystalline YCd6 intermetallic compound. Representative work: The interactions between conduction electrons and magnetism can significantly enhance the Hall signal, a phenomenon known as the anomalous Hall effect (AHE). While the AHE is generally not expected in antiferromagnets, a large AHE is observed in certain antiferromagnets with noncollinear spin textures and nonvanishing Berry curvature. In this work, we present a rich temperature and magnetic phase diagram with eight distinct magnetic phases for the antiferromagnetic kagome compound LuMn$_6$Sn$_6$. The Hall effect analysis in LuMn$_6$Sn$_6$ reveals both intriguing physical phenomena and methodological challenges. In the coplanar canted antiferromagnetic phase, we observe an AHE, which likely o We present a comprehensive investigation of the kagome metal ${\mathrm{LuV}}_{6}{\mathrm{Sn}}_{6}$ through magnetotransport and torque magnetometry studies in magnetic fields up to 41 T and temperatures as low as 0.3 K. Magnetoresistance measurements up to 31 T reveal clear Shubnikov--de Haas (SdH) oscillations with two dominant frequency peaks: ${F}_{\ensuremath{\alpha}}=12 \mathrm{T}$ and ${F}_{\ensuremath{\beta}}=155 \mathrm{T}$. The Berry phase ${\mathrm{\ensuremath{\Phi}}}_{\mathbf{B}}$, calculated from Landau level fan diagrams, indicates a nontrivial topology for both the $\ensuremath{\alpha}$- and $\ensuremath{\beta}$-orbits. To explore the possibility of higher-frequency signals in

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