Synthesis and single crystal study of CuMn3As2 and Cu2Mn4As3

Uhlířová, Klára; Tarasenko, R.; Martínez-Casado, Francisco J.; Vondráčková, B.; Matěj, Zdeněk

doi:10.1016/j.jallcom.2015.07.208

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…The imaginary part of permittivity shown by dashed line in Fig. 2 of the main text was measured on a bulk sample of CuMnAs grown using Bi flux similar to previously reported procedure 38,39 for the growth of CuMn 3 As 2 and Cu 2 Mn 4 As 3 . The elements with starting molar ratio Cu:Mn:As:Bi was 1:1:1:10 (1:1:1:15 also gives good results) were FIG.…”

Section: Orthorhombic Samplementioning

confidence: 97%

Band structure of CuMnAs probed by optical and photoemission spectroscopy

et al. 2018

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Tetragonal phase of CuMnAs progressively appears as one of the key materials for antiferromagnetic spintronics due to efficient current-induced spin-orbit torques whose existence can be directly inferred from crystal symmetry. Theoretical understanding of spintronic phenomena in this material, however, relies on the detailed knowledge of electronic structure (band structure and corresponding wave functions) which has so far been tested only to a limited extent. We show that AC permittivity (obtained from ellipsometry) and UV photoelectron spectra agree with density functional calculations. Together with the x-ray diffraction and precession electron diffraction tomography, our analysis confirms recent theoretical claim [Phys.Rev.B 96, 094406 (2017)] that copper atoms occupy lattice positions in the basal plane of the tetragonal unit cell.Magnetic moments in antiferromagnets have been notoriously difficult to manipulate. With the exception of materials having low Néel temperature and small magnetic anisotropy, very strong magnetic fields must be applied. Such fields would be too strong to be of any practical use and, moreover, they can never be applied as locally as electric pulses. Recently, an alternative manipulation mechanism has been proposed 1 which relies on current-induced spin-orbit torques (SOTs) acting in the bulk of the antiferromagnetic material. They result from a build-up of staggered spin polarisation (i.e. the one which alternates sign on two magnetic sublattices) in response to an applied uniform electric current; such polarisation can be calculated in the framework of linear response to electric field. 2,3 A prediction of sizable SOT in CuMnAs has soon been experimentally confirmed 4 and prototype memories where the writing is done using SOT have been demonstrated. 5 Devices based on thin films of CuMnAs thus claim a prominent role within the fast developing field of antiferromagnetic spintronics. 6,7 Quantitative modelling of SOT (and many other material-specific quantities) relies on a detailed knowledge of the electronic structure. 8 While well-established ab initio methods have been used for this purpose, little effort has so far been dedicated to validating the band structure in terms of comparing calculated and measured spectral properties. 9 We fill this gap by exploring the complex AC permittivity in the optical range and photoemission spectroscopy in the UV range (UPS) and comparing them to density functional theory (DFT) calculations. We find a good agreement between the experimental data and the calculated properties provided the elec-tronic correlations are treated beyond DFT, using Hubbard model characterised by an on-site repulsion U on Mn 3d orbitals. Moreover, we demonstrate that the AC permittivity in the optical range can be used to discern different phases of CuMnAs. Focusing on the tetragonal phase of CuMnAs, 10 we corroborate analysis of our spectral measurements by precession electron diffraction tomography (PEDT), which points to a phase recently claimed to have the lowest ...

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Section: Orthorhombic Samplementioning

confidence: 97%

Band structure of CuMnAs probed by optical and photoemission spectroscopy

et al. 2018

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“…Chunks of Bi were used as the flux, with the recipes described in detail in Ref. [12,14]. Magnetic susceptibility data with the magnetic field applied parallel to the a,b and c crystallographic axes were collected in a Quantum Design (QD) Magnetic Property Measurement System (MPMS).…”

Section: Experimental Methodsmentioning

confidence: 99%

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

Emmanouilidou

Liu

Graf

et al. 2019

Journal of Magnetism and Magnetic Materials

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“…Before any domain-switching studies were demonstrated, bulk tetragonal CuMnAs was shown to be stabilized by the addition of excess nominal Cu in solid-state reactions. 4 A large variation in the Néel temperature T N from 507 K to 320 K has been shown as Cu excess in Cu 1+x Mn 1−x As increases from x = 0.02 to 1.4, 5 and a weak ferromagnetic transition around 300 K was reported around x = 0. 6 On the Mn excess side, orthorhombic CuMn 3 As 2 is formed as a stable phase.…”

Section: Introductionmentioning

confidence: 97%

“…6 On the Mn excess side, orthorhombic CuMn 3 As 2 is formed as a stable phase. 4 When Cu, Mn, and As are mixed stoichiometrically, CuMnAs crystallizes in an orthorhombic P nma phase. 7 Orthorhombic CuMnAs is the first compound to have been proposed as a magnetically-ordered Dirac semimetal 8 and has been discussed for the possibility of voltage-induced switching.…”

Section: Introductionmentioning

confidence: 99%

In-plane hexagonal antiferromagnet in the Cu-Mn-As system Cu0.82Mn1.18As

Karigerasi

Kang

Ramanathan

et al. 2019

Phys. Rev. Materials

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We report the single-crystal growth and characterization of a new hexagonal phase, Cu0.82Mn1.18As, in the Cu-Mn-As system. This compound contains the same square-pyramidal MnAs5 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 Cu0.82Mn1.18As 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 Néel 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. arXiv:1908.01758v1 [cond-mat.mtrl-sci]

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Synthesis and single crystal study of CuMn3As2 and Cu2Mn4As3

Cited by 9 publications

References 8 publications

Band structure of CuMnAs probed by optical and photoemission spectroscopy

Band structure of CuMnAs probed by optical and photoemission spectroscopy

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

In-plane hexagonal antiferromagnet in the Cu-Mn-As system Cu0.82Mn1.18As

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