Signatures of a gapless quantum spin liquid in the Kitaev material Na3Co2−xZnxSbO6

Spin-Cluster Glassy and Long-Range Ordered Magnetic States in Honeycomb-Layered Compositionally Complex Oxides Na3–xLixT2SbO6 (T = Cu1/3Ni1/3Co1/3)

“…Several quasi-binary solid solutions A 3 M 2– x M′ x XO 6 have been studied, − but we could not find any report on magnetism of A 3 M 2 XO 6 with a combination of more than two M 2+ cations. The only known work on truly high-entropy Na 3 M 2 SbO 6 materials combining up to five M cations is devoted to photocatalysis and does not report magnetic properties.…”

“…Na 3 T 2 SbO 6 is an antiferromagnet with a Néel temperature of 10.2 Κ. This is between the transition temperatures of its constituent Na 3 M 2 SbO 6 : 4.4 or 7 Κ (M = Co) and 16.5 or 18 K (M = Ni). The formal analogue with M = Cu, however, is not considered as a honeycomb structure: due to the Jahn–Teller distortion, Cu–Cu distances are there significantly different (3.20 × 2 and 2.96 Å), resulting in formation of dimers and alternating frustrated spin chains .…”

“…Both Li 3 Co 2 SbO 6 and Na 3 Co 2 SbO 6 , were proposed as Kitaev spin liquid candidates, but eventually, they were found to be ordered antiferromagnetically at low temperatures. Signatures of a gapless quantum spin liquid have been detected in the Kitaev material Na 3 Co 2– x Zn x SbO 6 …”