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: 6 апреля 2016 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
CuO2 layers and CuO2-twisted ribbons. Despite seemingly
low-dimensional motives in the structure, shattuckite
exhibits properties of three-dimensional antiferromagnet
with Weiss/Neel temperatures ratio Θ/TN ~ 2 being
weakly ferromagnetic below magnetic ordering temperature
TN = 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 CuO2
units within the layers and weak ferromagnetic coupling of
edge-sharing CuO2 units within the ribbons.