The long-range magnetic order and underlying spin model in shattuckite Cu5(SiO3)4(OH)2статья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:The mineral shattuckite Cu5(SiO3)4(OH)2 is investigated in measurements of X-band electron spin resonance, magnetization and specific heat. The magnetic subsystem of the title compound is
constituted by unique combination of well separated brucite-like corrugated CuO layers and CuO twisted ribbons. Despite seemingly low-dimensional motives in the structure, shattuckite exhibits properties of three-dimensional antiferromagnet with Weiss/Neel temperatures ratio Θ/T ~ 2 being weakly ferromagnetic below magnetic ordering temperature T = 7 K. Tentatively, the spontaneous magnetization appears due to Dzyaloshinskii–Moriya interactions within the brucite-like two-dimensional patterns. The electronic structure calculations suggest strong antiferromagnetic coupling of both edge-sharing and
corner-sharing CuO units within the layers and weak ferromagnetic coupling of edge-sharing CuO units within the ribbons.