Spin-flop phase transition in the orthorhombic antiferromagnetic topological semimetal Cu0.95MnAs

Abstract

The orthorhombic antiferromagnetic compound CuMnAs was recently predicted to be an antiferromagnetic Dirac semimetal if both the Ry gliding and S2z rotational symmetries are preserved in its magnetic ordered state. In our previous work on Cu0.95MnAs and Cu0.98Mn0.96As, we showed that in their low temperature commensurate antiferromagnetic state the b axis is the magnetic easy axis, which breaks the S2z symmetry. As a result, while the existence of Dirac fermions is no longer protected, the polarized surface state makes this material potentially interesting for antiferromagnetic spintronics. In this paper, we report a detailed study of the anisotropic magnetic properties and magnetoresistance of Cu0.95MnAs and Cu0.98Mn0.96As. Our study shows that in Cu0.95MnAs the b axis is the easy axis and the c axis is the hard axis. Furthermore, it reveals that Cu0.95MnAs features a spin-flop phase transition at high temperatures and low fields when the field is applied along the easy b axis, resulting in canted antiferromagnetism. However, no metamagnetic transition is observed in Cu0.98Mn0.96As, indicating that the magnetic interactions in this system are very sensitive to Cu vacancies and Cu/Mn site mixing.

References in corpus (8)

• Antiferromagnetic spintronics
• Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet
• Strong Spin Hall Effect in the Antiferromagnet PtMn
• Anomalous Hall effect in the noncollinear antiferromagnet Mn5Si3
• High-field magnetization and magnetic phase diagram of $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Magnetic order induces symmetry breaking in the single crystalline orthorhombic CuMnAs semimetal
• Spin-flop transition and magnetic phase diagram in CaCo${}_2$As${}_2$ revealed by torque measurements
• Massive fermions with low mobility in antiferromagnet orthorhombic CuMnAs single crystals

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• Highly sensitive magnetic properties and large linear magnetoresistance in antiferromagnetic CrxSe(0.875\lex\le1)single crystals
• Single crystalline orthorhombic GdAlGe as a rare earth magnetic Dirac nodal-line metal
• High-resolution diffraction reveals magnetoelastic coupling and coherent phase separation in tetragonal CuMnAs
• Ground and Applied-Field-Driven Magnetic States of Antiferromagnets