Perfect kagome-lattice antiferromagnets with J\(_{eff}\) = 1/2: The Co\(^{2+}\)-analogs of copper minerals volborthite and vesignieite

• Published in: arXiv.org
• Main Authors: Haraguchi, Yuya, Ohnoda, Takehiro, Matsuo, Akira, Kindo, Koichi, Hiroko Aruga Katori
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 07.12.2022
• Subjects: Antiferromagnetism; Copper; Crystal structure; Ferromagnetism; Filing; Low temperature; Magnetic properties; Magnets; Physics - Materials Science; Physics - Strongly Correlated Electrons
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2212.03486

We report the synthesis, crystal structure, and magnetic properties of Co\(^{2+}\) kagome magnets Co\(_3\)V\(_2\)O\(_7\)(OH)$_2$$\cdot\(2H\)_2\(O and BaCo\)_3\((VO\)_4\()\)_2\((OH)\)_2\(, which can be recognized as Co-analogues of the intensively researched quantum kagome magnet volborthite Cu\)_3\(V\)_2\(O\)_7\((OH)\)_2$$\cdot\(2H\)_2\(O and vesignieite BaCu\)_3\((VO\)_4\()\)_2\((OH)\)_2\(. For each compound, the ground state is seemingly A-type antiferromagnetic order. At low temperatures, applying a magnetic field causes a metamagnetic-like transition described by the transition in which antiferromagnetically-aligned canted moments change to ferromagnetically-aligned ones. These ground and field-induced states include a canted ferromagnetic component perpendicular to the kagome planes favored by Dzyaloshinskii-Moriya interactions. These magnetic properties are well characterized by the J\)_{eff}\( = 1/2 physics. Our findings will be the first step toward clarifying the J\)_{eff}$ = 1/2 kagome physics, which has been little studied experimentally or theoretically.