Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Complex Oxides and Other Materials
TT 54.8: Vortrag
Donnerstag, 4. April 2019, 11:30–11:45, H22
Structural and magnetic properties of vanadium trihalides VX 3 (X = Cl, Br) — •Neetika Neetika1, Reinhard K Kremer1, and Christina Drahten2 — 1Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany — 2ESRF - the European Synchrotron, 71, Avenue des Martyrs, 38000 Grenoble, France
We have examined the structural and magnetic properties of the layered vanadium trihalides, VX 3 (X = Cl, Br). For both systems, specific heat measurements indicate two anomalies at ∼ 25K and ∼ 100K. Magnetization measurements prove antiferromagnetic ordering below ∼ 25K and negative Weiss temperatures indicating predominant antiferromagnetic interactions. Laboratory-based and synchrotron x-ray diffraction measurements show that anomaly at ∼ 100K is associated to a structural phase transition from the rhombohedral BiI3 structure-type (R3) at high temperature to either a monoclinic (C2/c) or triclinic (P1) crystal structure at low temperature. First-principle calculations also indicate that the structural phase transition from rhombohedral to either monoclinic or triclinic is energetically favorable.