Repozytorium publikacji - Politechnika Gdańska

Geometrically frustrated lattices combined with magnetism usually host quantum fluctuations that suppress magnetic orders and generate highly entangled ground states. Three-dimensionally (3D) frustrated magnets generally exist in the diamond and pyrochlore lattices, while two-dimensionally (2D) frustrated geometries contain Kagomé, triangular, and honeycomb lattices. In this work, we reported using chemical pressure to tune the magnetism of the pyrochlore lattice in LiYbSe2 into a triangular lattice by doping Ga or In. Li3−xGaxYb3Se6 and Li3−xInxYb3−yInySe6/Li3−xInxYb3−y□ySe6 crystallize in a trigonal α-NaFeO2 structure-type (space group R3̅m) and can be synthesized using either LiCl or Se flux. In Li3−xGaxYb3Se6, Ga3+ and Li+ are mixed, leaving Yb3+ on the triangular plane. Instead of just Li+ being replaced in Li3−xGaxYb3Se6, In3+ was observed in both the Li+ and Yb3+ layers in Li3−xInxYb3−yInySe6 depending on the reaction conditions. Dominant antiferromagnetic interactions are revealed by magnetic measurements in both Li3−xGaxYb3Se6 and Li3−xInxYb3−yInySe6/ Li3−xInxYb3−y□ySe6. However, no long-range magnetic order is detected in thermomagnetic measurements above 1.8 K due to geometrical frustration. Thus, Li3−xGaxYb3Se6, Li3−xInxYb3−yInySe6/Li3−xInxYb3−y□ySe6, and the LiYbSe2 previously discovered by our group provide an ideal platform to understand the complex structure−magnetism correlations from 3D to 2D frustrated lattices.

Autorzy

• Ranuri S. Dissanayaka Mudiyanselage,
• prof. dr hab. inż. Tomasz Klimczuk link otwiera się w nowej karcie ,
• Danrui Ni,
• Robert J. Cava,
• Weiwei Xie