Strongly canted antiferromagnetic ground state in Cu3(OH)2F4

Abstract

An unique crystal structure of copper hydroxyl-fluorite, Cu3(OH)2F4, hosts the trimerized chains of both edge-sharing and corner-sharing CuO2F2 plaquettes. The results of the comprehensive study of this compound, including new synthetic route, measurements of specific heat, acand dc-susceptibility, pulsed field magnetization, electron spin resonance, muon spin rotation and relaxation and first principles calculations are presented. The data evidence magnetic phase transition at TC = 12.5 K into canted antiferromagnetic state which is due to antisymmetric Dzyaloshinskii-Moriya (DM) exchange interaction. No alteration of DM component stemming from the intrinsic features of the crystal lattice in Cu3(OH)2F4 results in unusually large spontaneous magnetization. At T < TC, the remanence MR constitutes significant portion of saturation magnetization MS which defines the canting angle  = 4.

Rb2CaCu6(PO4)4O2, a novel oxophosphate with a shchurovskyite-type topology: synthesis, structure, magnetic properties and crystal chemistry of rubidium copper phosphates

“…2 and Fig. 3 whole temperature range investigated, with values g 1 = 2.07 AE 0.01, g 2 = 2.20 AE 0.01 and g 3 = 2.31 AE 0.01 resulting in averaged g av = 2.20 AE 0.02, which is consistent with typical values for Cu 2+ ions in other copper oxides (Zakharov et al, 2014;Danilovich et al, 2019). Remarkably, the obtained experimental g-values agree quite well with the theoretically calculated ones listed in Table 4.…”