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An in-plane hexagonal antiferromagnet in the Cu-Mn-As system, Cu$ {0.82}$Mn$ {1.18}$As by Karigerasi, Manohar H.; Kang, Kisung; Ramanathan, Arun; Gray, Danielle L.; Frontzek, Matthias D.; Cao, Huibo; Schleife, André; Shoemaker, Daniel P. is a scholarly article available to read on EtoBox.

What is An in-plane hexagonal antiferromagnet in the Cu-Mn-As system, Cu$ {0.82}$Mn$ {1.18}$As about?

We report the single-crystal growth and characterization of a new hexagonal phase, Cu$_{0.82}$Mn$_{1.18}$As, in the Cu-Mn-As system. This compound contains the same square-pyramidal MnAs$_5$ units as the tetragonal and orthorhombic polymorphs of CuMnAs. Calorimetry, magnetometry, and neutron diffraction measurements reveal antiferromagnetic ordering at 270 K. The magnetic structure consists of a triangular arrangement of spins in the $ab$ plane. Hexagonal Cu$_{0.82}$Mn$_{1.18}$As shows resistivity that varies only weakly from 5 K to 300 K, and is many times higher than tetragonal CuMnAs, indicative of a strongly-scattering metal. First-principles calculations confirm the metallic band structure with a small density of states at the Fermi energy. The neutron-refined magnetic ground state is close to the computationally-determined minimum energy configuration. This compound should serve as a clear control when disentangling the effects of current-driven N\'{e}el switching of metallic antiferromagnets since it exhibits in-plane spins but the magnetic ordering does not break degeneracy along the $a$ and $b$ directions, unlike tetragonal CuMnAs.

Author

Karigerasi, Manohar H.; Kang, Kisung; Ramanathan, Arun; Gray, Danielle L.; Frontzek, Matthias D.; Cao, Huibo; Schleife, André; Shoemaker, Daniel P.

Published

2019

Language

EN