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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.5: Poster

Wednesday, March 14, 2018, 15:00–19:00, Poster B

Crystal structure and magnetic properties of CeMg_3−xAg_x — •Alexander Engel¹, Georg Eickerling², Ernst-Wilhelm Scheidt², Philipp Gegenwart¹, and Veronika Fritsch¹ — ¹EP 6, Electronic Correlations and Magnetism, Augsburg University, Germany — ²Chemical Physics and Materials Science, Augsburg University, Germany

CeMg₃ crystallizes in a BiF₃ cubic heusler-phase type structure and is a heavy-fermion antiferromagnet with T_N = 3.4 K. Gradually substituting Mg with Ag makes it possible to tune the exchange interaction and hereby the antiferromagnetic order. Furthermore a structural phase transition accompanied by a charge density wave occurs for x ≥ 1.5. This structural phase transition was confirmed by temperature dependent single crystal x-ray diffraction. Moreover we show measurements of electrical resistivity and heat capacity on polycrystals tracking the magnetic order and structural phase transition in the alloy-series of CeMg_3−xAg_x and discuss a possible structural quantum critical point.