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000859488 1001_ $$0P:(DE-HGF)0$$aRegnat, A.$$b0$$eCorresponding author
000859488 245__ $$aCanted antiferromagnetism in phase-pure CuMnSb
000859488 260__ $$aCollege Park, MD$$bAPS$$c2018
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000859488 520__ $$aWe report the low-temperature properties of phase-pure single crystals of the half-Heusler compound CuMnSb grown by means of optical float zoning. The magnetization, specific heat, electrical resistivity, and Hall effect of our single crystals exhibit an antiferromagnetic transition at TN=55 K and a second anomaly at a temperature T∗≈34 K. Powder and single-crystal neutron diffraction establish an ordered magnetic moment of (3.9±0.1)μB/f.u., consistent with the effective moment inferred from the Curie-Weiss dependence of the susceptibility. Below TN, the Mn sublattice displays commensurate type-II antiferromagnetic order with propagation vectors and magnetic moments along ⟨111⟩ (magnetic space group R[I]3c). Surprisingly, below T∗, the moments tilt away from ⟨111⟩ by a finite angle δ≈11∘, forming a canted antiferromagnetic structure without uniform magnetization consistent with magnetic space group C[B]c. Our results establish that type-II antiferromagnetism is not the zero-temperature magnetic ground state of CuMnSb as may be expected of the face-centered cubic Mn sublattice.
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