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000188375 005__ 20210129215200.0
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000188375 1001_ $$0P:(DE-HGF)0$$avan Well, Natalija$$b0
000188375 245__ $$aLow-temperature structural investigations of the frustrated quantum antiferromagnets Cs2CuCl(4-x)Br(x)
000188375 260__ $$c2014
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000188375 520__ $$aPowder X-ray diffraction (PXRD) and single-crystal neutron scattering were used to study in detail the structural properties of the Cs2CuCl(4-x)Br(x) series, good realizations of layered triangular antiferromagnets. Detailed temperature-dependent PXRD reveal a pronounced anisotropy of the thermal expansion for the three different crystal directions of the orthorhombic structure without any structural phase transition down to 20 K. Remarkably, the anisotropy of the thermal expansion varies for different $x$, leading to distinct changes of the geometry of the local Cu environment as a function of temperature and composition. The refinement of the atomic positions confirms that for x=1 and 2, the Br atoms occupy distinct halogen sites in the [CuX4]-tetrahedra (X = Cl, Br). The precise structure data are used to calculate the magnetic exchange couplings using density functional methods for x=0. We observe a pronounced temperature dependence of the calculated magnetic exchange couplings, reflected in the strong sensitivity of the magnetic exchange couplings on structural details. These calculations are in good agreement with the experimentally established values for Cs2CuCl4 if one takes the low-temperature structure data as a starting point.
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000188375 7001_ $$0P:(DE-HGF)0$$aFoyevtsova, Kateryna$$b1
000188375 7001_ $$0P:(DE-HGF)0$$aGottlieb-Schoenmeyer, Saskia$$b2
000188375 7001_ $$0P:(DE-HGF)0$$aRitter, Franz$$b3
000188375 7001_ $$0P:(DE-HGF)0$$aManna, Rudra Sekhar$$b4
000188375 7001_ $$0P:(DE-HGF)0$$aWolf, Bernd$$b5
000188375 7001_ $$0P:(DE-Juel1)164297$$aMeven, Martin$$b6$$ufzj
000188375 7001_ $$0P:(DE-HGF)0$$aPfleiderer, Christian$$b7
000188375 7001_ $$0P:(DE-HGF)0$$aLang, Michael$$b8
000188375 7001_ $$0P:(DE-HGF)0$$aAssmus, Wolf$$b9
000188375 7001_ $$0P:(DE-HGF)0$$aValenti, Roser$$b10
000188375 7001_ $$0P:(DE-HGF)0$$aKrellner, Cornelius$$b11$$eCorresponding Author
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