Nuclear and magnetic structure in powders and single crystals of Cr2Ge2Te6 – Stacking faults?:
The Mermin-Wagner theorem predicts that magnetic ordering in a truly two-dimensional magnet is marginal with long-range order predicted to occur in anisotropic environments and no ordering is expected in isotropic cases such as Heisenberg type symmetries. We recently investigated the magnetic fluctuations at low energies in two dimensional Cr2Ge2Te6 using MACS finding incommensurate magnetic fluctuations forming nearly vertical rods of scattering in momentum and energy as well as localized ferromagnetic fluctuations. The high velocity nature of these incommensurate excitations is indicative of an underlying large energy scale possibly connected with the semiconducting electronic nature of this material or a more complex ferromagnetic structure. We propose to investigate the nuclear and magnetic structure using the diffractometers at the ILL. In particular, we aim to 1) search for static incommensurate magnetic peaks; 2) Measure the commensurate magnetic structure ; 3) measure the nuclear structure in powders and single crystals to search for differences.
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SONGVILAY Manila; BEAUVOIS Ketty; OULADDIAF Bachir; PACHOUD Elise; QURESHI Navid; RESSOUCHE Eric; RITTER Clemens; STOCK Christopher and STUNAULT Anne. (2019). Nuclear and magnetic structure in powders and single crystals of Cr2Ge2Te6 – Stacking faults?:. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1007
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