  The kagome lattice, consisting of interconnected triangles and hexagons
uniquely, is an excellent model system for study frustrated magnetism,
electronic correlation and topological electronic structure. After an intensive
investigation on frustrated magnetism in insulating magnetic kagome lattices,
the interplay between charge and spin degrees of freedom via spin-orbital
coupling in metallic systems (kagome metals) has become an attractive topic
recently. Here, we study centrosymmetric YMn6Sn6 with Mn kagome lattice. We
discover that it exhibits giant topological Hall effect near room temperature,
ascribed to the field-induced non-collinear spin texture, possibly a skyrmion
lattice (SkL) state. Combined with the large intrinsic anomalous Hall effect,
YMn6Sn6 shows a synergic effect of real- and momentum-space Berry phase on
physical properties. Since the features of tunable magnetic interaction and
flexible structure in this large homologous series, it provides a novel
platform for understanding the influence of electronic correlations on
topological quantum states in both real and momentum spaces.
