Antiferromagnetic ground state in the MnGa4 intermetallic compound
Abstract
Magnetism of the binary intermetallic compound MnGa4 is re-investigated. Band-structure calculations predict antiferromagnetic behavior in contrast to Pauli paramagnetism reported previously. Magnetic susceptibility measurements on single crystals indeed reveal an antiferromagnetic transition at TN=393 K. Neutron powder diffraction and 69,71Ga nuclear quadrupole resonance spectroscopy show collinear antiferromagnetic order with magnetic moments alligned along the [111] direction of the cubic unit cell. The magnetic moment of 0.80(3)μB at 1.5 K extracted from the neutron data is in good agreement with the band-structure results.
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