A cascade of magnetic phase transitions and a 1/3-magnetization plateau in selenite-selenate Co3(SeO3)(SeO4)(OH)2 with kagomé-like Co2+ ion layer arrangements: the importance of identifying a correct spin lattice

A F Murtazoev; P S Berdonosov; K A Lyssenko; V A Dolgikh; M Y Geidorf; O S Volkova; H-J Koo; M-H Whangbo; A N Vasiliev

doi:10.1039/d3dt01620j

A cascade of magnetic phase transitions and a 1/3-magnetization plateau in selenite-selenate Co₃(SeO₃)(SeO₄)(OH)₂ with kagomé-like Co²⁺ ion layer arrangements: the importance of identifying a correct spin lattice

Dalton Trans. 2023 Jul 18;52(28):9664-9672. doi: 10.1039/d3dt01620j.

Authors

A F Murtazoev^{1

2}, P S Berdonosov^{1

2}, K A Lyssenko^{1

3}, V A Dolgikh¹, M Y Geidorf^{1

2}, O S Volkova^{1

2}, H-J Koo⁴, M-H Whangbo^{4

5}, A N Vasiliev²

Affiliations

¹ Lomonosov Moscow State University, Moscow 119991, Russia.
² National University of Science and Technology "MISiS", Moscow 119049, Russia.
³ Plekhanov Russian University of Economics, Moscow 117997, Russia.
⁴ Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea.
⁵ Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA.

PMID: 37381750
DOI: 10.1039/d3dt01620j

Abstract

We prepared a new compound, Co₃(SeO₃)(SeO₄)(OH)₂, having layers in a kagomé-like arrangement of Co²⁺ (spin S = 3/2) ions. This phase crystallizes in the orthorhombic space group Pnma (62) with unit cell parameters a = 11.225(9) Å, b = 6.466(7) Å and c = 11.530(20) Å. Its layers, parallel to the ab-plane, are made up of Co1O₅ square pyramids and Co2O₆ and Co3O₆ octahedra. As the temperature is lowered, Co₃(SeO₃)(SeO₄)(OH)₂ undergoes three successive magnetic transitions at 27.5, 19.4 and 8.1 K, and the magnetization of Co₃(SeO₃)(SeO₄)(OH)₂ measured at 2.4 K exhibits a 1/3-magnetization plateau between 7.8 and 19.9 T. The H-T magnetic phase diagram constructed for Co₃(SeO₃)(SeO₄)(OH)₂ from ac and dc magnetic susceptibility, specific heat and magnetization measurements contains three magnetic phases I, II and III. Phase I is antiferromagnetic, while phases II and III are ferrimagnetic and responsible for the 1/3-magnetization plateau. To interpret these complex magnetic properties, we identified the correct spin lattice for Co₃(SeO₃)(SeO₄)(OH)₂ by evaluating its intralayer and interlayer spin exchanges based on spin-polarized DFT+U calculations.