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- W2024233670 abstract "The magnetic behavior of Mn(SCN${)}_{2}$(${mathrm{CH}}_{3}$OH${)}_{2}$ in single-crystal form has been studied, and the crystal structure has also been determined. The system is monoclinic, C2/c, Z=4 with a=14.467(5) AA{}, b=5.927(2) AA{}, c=10.979(3) AA{}, and ensuremath{beta}=93.19(3)ifmmode^circelsetextdegreefi{}. Manganese ions, of distorted octahedral coordination, are coupled together into quasi-two-dimensional arrays by bridging thiocyanate groups, and also by some hydrogen bonding. Potential interlayer-superexchange pathways are substantially less efficient, though probably not insignificant either. The magnetic properties seem consistent with the structural features. The single-crystal susceptibility exhibits uniaxial anisotropy in the paramagnetic regime, with ${mathrm{ensuremath{chi}}}_{mathit{a}}^{mathrm{*}}$ somewhat larger than ${mathrm{ensuremath{chi}}}_{mathit{b}}$ensuremath{approxeq}${mathrm{ensuremath{chi}}}_{mathit{c}}$. A broad maximum appears at 12.6(4) K in ${mathrm{ensuremath{chi}}}_{mathit{b}}$ and ${mathrm{ensuremath{chi}}}_{mathit{c}}$, and a sharper maximum at 10.5 K in ${mathrm{ensuremath{chi}}}_{mathit{a}}^{mathrm{*}}$.An antiferromagnetic transition at 10.5(2) K is also apparent in the b- and c-axis susceptibilities, and below this temperature substantial anisotropies appear. A weak ferromagnetic moment develops along the b axis below 10.5 K, and from the magnitude of the spontaneous moment along this axis it is deduced that the spins are canted 0.20ifmmode^circelsetextdegreefi{} from the c axis toward b. A possible spin-reorientation transition at 3.${7}_{5}$ K is also apparent. High-temperature series-expansion fits to the susceptibilities suggest that a two-dimensional Heisenberg model is appropriate, but that interlayer exchange cannot be neglected; derived parameters are J/k=-0.70(3) K and J'/k=-0.16(2) K. The anisotropy observed in the paramagnetic regime suggests that a rather strong single-ion anisotropy of the form D[S^ $_{mathit{z}}^{2}mathit{S}$(S+1)/3], with D/k=0.29(2) K, is also present. The results are compared with various theoretical predictions for two-dimensional and three-dimensional models, and it appears that the system is more or less intermediate between these two lattice dimensionalities. The canting that is observed is almost certainly due to site-inequivalent single-ion anisotropy rather than to antisymmetric exchange. A detailed consideration of intralayer- and interlayer-superexchange pathways is also presented, and rather satisfactorily accounts for the observed differences in exchange interactions between this system and the analogous ethanol compound." @default.
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- W2024233670 title "Magnetic and structural properties of Mn(SCN<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CH</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>OH<mml:math xmlns:mml…" @default.
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- W2024233670 doi "https://doi.org/10.1103/physrevb.41.9074" @default.
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