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- W2570511738 abstract "Insulating Nb$_3$Cl$_8$ is a layered chloride consisting of two-dimensional triangular layers of $S_{eff}$ = 1/2 Nb$_3$Cl$_{13}$ clusters at room temperature. Magnetic susceptibility measurement show a sharp, hysteretic drop to a temperature independent value below $T = 90$ K. Specific heat measurements show that the transition is first order, with $Delta S approx 5 mathrm{J cdot K^{-1} cdot mol mathit{f.u.}^{-1}}$, and a low temperature $T$-linear contribution originating from defect spins. Neutron and X-ray diffraction show a lowering of symmetry from trigonal $Pbar{3}m1$ to monoclinic $C2/m$ symmetry, with a change in layer stacking from -AB-AB- to -AB$^prime$-BC$^prime$-CA$^prime$- and no observed magnetic order. This lowering of symmetry and rearrangement of successive layers evades geometric magnetic frustration to form a singlet ground state. It is the lowest temperature at which a change in stacking sequence is known to occur in a Van-der-Waals solid, occurs in the absence of orbital degeneracies, and suggests that designer 2-D heterostructures may be able to undergo similar phase transitions." @default.
- W2570511738 created "2017-01-13" @default.
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- W2570511738 date "2017-01-01" @default.
- W2570511738 modified "2023-10-16" @default.
- W2570511738 title "Rearrangement of van der Waals stacking and formation of a singlet state at T = 90 K in a cluster magnet" @default.
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- W2570511738 doi "https://doi.org/10.1039/c6qi00470a" @default.
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