PHYSICAL REVIEW LETTERS 136, 036505 (2026)

The anomalous Nernst effect (ANE), generating a voltage perpendicular to a temperature gradient due tomagnetization, is closely linked to the Berry curvature (BC) near the Fermi energy in topological magnets.We report an enhanced spontaneous ANE in the ferromagnetic Kondo lattice CeCo2As2, which featuresKondo-screened cerium-based 4f moments embedded in a ferromagnetic d-electron framework. Theobserved large anomalous Nernst coefficient, greater than the Seebeck coefficient, is attributed to the strongBCpresent in the f-orbital-dominated flat bands. The enhanced ANE in CeCo2As2 serves as a signature ofthe Fermi energy pinning within the topological flat band, highlighting the correlation-driven topology inthe Kondo lattice.

We report the magnetic properties of newly synthesized single crystals of TbTi₃Bi₄, featuring alternating terbium-based zigzag chains and titanium-based kagome lattices. The compound exhibits extreme easy-axis magnetic anisotropy due to crystalline-electric-field effects that align Tb³⁺ moments along the chain direction. Combined strong single-ion anisotropy and competing magnetic interactions lead to quasi-one-dimensional Ising behavior with antiferromagnetic ordering at Tₙ = 20.4 K. Applied magnetic fields along the chain direction induce multiple metamagnetic transitions between 1/3 and other magnetization plateaus. We construct a field-temperature phase diagram and elucidate the complex magnetic structures arising from frustration. [Phys. Rev. B 110, 064416 (2024)] PhysRevB.110.064416.pdf

The quantum-level interplay between geometry, topology and correlation is at the forefront of fundamental physics. Kagome magnets are predicted to support intrinsic Chern quantum phases owing to their unusual lattice geometry and breaking of time-reversal symmetry. However, quantum materials hosting ideal spin-orbit-coupled kagome lattices with strong out-of-plane magnetization are lacking. Here, using scanning tunnelling microscopy, we identify a new topological kagome magnet, TbMn₆Sn₆, that is close to satisfying these criteria.Nature, 583, 533-536 (2020). PDF Download

Topological electrons in semimetals are usually vulnerable to a chemical doping and environment change, which restricts their potential application in future electronic devices. In this paper, we report that the type-II Dirac semimetal VAl3 hosts exceptional, robust topological electrons which can tolerate extreme change of chemical composition. The Dirac electrons remain intact, even after a substantial part of V atoms have been replaced in the V1−xTixAl3 solid solutions.PNAS, July 7, 2020 117 (27) 15517-15523. PDF Download