Perfect kagome-lattice antiferromagnets with Jeff = 1/2: The Co2+-analogs of copper minerals volborthite and vesignieite
Abstract
We report the synthesis, crystal structure, and magnetic properties of Co2+ kagome magnets Co3V2O7(OH)2·2H2O and BaCo3(VO4)2(OH)2, which can be recognized as Co-analogues of the intensively researched quantum kagome magnet volborthite Cu3V2O7(OH)2·2H2O and vesignieite BaCu3(VO4)2(OH)2. For each compound, the ground state is seemingly A-type antiferromagnetic order. At low temperatures, applying a magnetic field causes a metamagnetic-like transition described by the transition in which antiferromagnetically-aligned canted moments change to ferromagnetically-aligned ones. These ground and field-induced states include a canted ferromagnetic component perpendicular to the kagome planes favored by Dzyaloshinskii-Moriya interactions. These magnetic properties are well characterized by the Jeff = 1/2 physics. Our findings will be the first step toward clarifying the Jeff = 1/2 kagome physics, which has been little studied experimentally or theoretically.
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