Journal Article FZJ-2019-00341

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Canted antiferromagnetism in phase-pure CuMnSb

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2018
APS College Park, MD

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Abstract: We 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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd) ; Crystallography (2nd)

Classification:

Contributing Institute(s):
  1. JCNS-FRM-II (JCNS-FRM-II)
  2. Streumethoden (JCNS-2)
  3. Heinz Maier-Leibnitz Zentrum (MLZ)
Research Program(s):
  1. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
  2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
Experiment(s):
  1. HEiDi: Single crystal diffractometer on hot source (SR9b)
  2. MIRA: Multipurpose instrument (NL6N)
  3. RESI: Thermal neutron single crystal diffractometer (SR8b)
  4. SPODI: High resolution powder diffractometer (SR8a)
  5. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)

Appears in the scientific report 2018
Database coverage:
American Physical Society Transfer of Copyright Agreement ; OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Science Citation Index Expanded ; Web of Science Core Collection
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The record appears in these collections:
Institute Collections > JCNS > JCNS-FRM-II
Document types > Articles > Journal Article
Institute Collections > JCNS > JCNS-2
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Open Access

 Record created 2019-01-16, last modified 2021-01-30


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