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

Emmanouilidou, Eve; Liu, Jinyu; Graf, David; Cao, Huibo; Ni, Ni

doi:10.1016/j.jmmm.2018.08.084

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…It was then experimentally observed in a CuCl 2 •2H 2 O single crystal [95]. After that, the SFO phase transition has been extensively investigated, and the phenomenological theory has also been comprehensively developed [96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122]. It is generally confirmed that the SFO phase transition is of FO type [85,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137].…”

Section: Introductionmentioning

confidence: 87%

Ground and Applied-Field-Driven Magnetic States of Antiferromagnets

Li,

Tang

2021

Preprint

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As discussed in this chapter, we develop a mean-field mathematical method to calculate the ground states of antiferromagnets and better understand the applied magnetic-field induced exotic properties. Within antiferromagnetic materials competitive and cooperative interactions exist leading to substance extraordinary magnetic states. Our calculations predict that applying a magnetic field to antiferromagnets can switch it from one magnetic state to another. These include antiferromagnetic ground state, spin-flop transition, spin-flopped state, spin-flip transition and spin-flipped state. Our framework successfully demonstrates these phase changes. With this, a map of all equilibrium magnetic ground states, as well as the respective equilibrium phase conditions, are derived.Our study provides insight into the origins of the various magnetic states.

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Section: Introductionmentioning

confidence: 87%

Ground and Applied-Field-Driven Magnetic States of Antiferromagnets

Li,

Tang

2021

Preprint

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“…On the other hand, compared with the nonmagnetic Dirac semimetals, the magnetic Dirac quasiparticles can be controlled by the Néel spin-orbit torques and induce the topological metal-insulator transition, in which, the Néel vector orientation can switch on/off the symmetry that protect the Dirac band crossings [157,158]. Hence the TRS breaking Dirac semimetals are promising for the spinorbitronics application [41,[159][160][161]. In the following, we review the prediction of magnetic DSMs CuMnAs and EuCd 2 As 2 , in which the "magnetic symmetry" causing Kramers degeneracy are IT and Iτ T , and the Dirac nodes are protected by the screw axis C2z = {C 2z | 1 2 0 1 2 } and three-fold rotation C 3z , respectively.…”

Section: Magnetic Dirac Semimetalsmentioning

confidence: 99%

The study of magnetic topological semimetals by first principles calculations

Zou

2019

npj Comput Mater

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Magnetic topological semimetals (TSMs) are topological quantum materials with broken timereversal symmetry (TRS) and isolated nodal points or lines near the Fermi level. Their topological properties would typically reveal from the bulk-edge correspondence principle as nontrivial surface states such as Fermi arcs or drumhead states, etc. Depending on the degeneracies and distribution of the nodes in the crystal momentum space, TSMs are usually classified into Weyl semimetals (WSMs), Dirac semimetals (DSMs), nodal-line semimetals (NLSMs), triple-point semimetals (TPSMs), etc.In this review article, we present the recent advances of magnetic TSMs from a computational perspective. We first review the early predicted magnetic WSMs such as pyrochlore iridates and HgCr2Se4, as well as the recently proposed Heusler, Kagome layers, and honeycomb lattice WSMs.Then we discuss the recent developments of magnetic DSMs, especially CuMnAs in Type-III and EuCd2As2 in Type-IV magnetic space groups (MSGs). Then we introduce some magnetic NLSMs that are robust against spin-orbit coupling (SOC), namely Fe3GeTe2 and LaCl (LaBr). Finally, we discuss the prospects of magnetic TSMs and the interesting directions for future research. *

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“…[14][15][16] However, when Cu, Mn, and As elemental powders are mixed in stoichiometric proportions, the orthorhombic polymorph of CuMnAs is stabilized. [17][18][19] Typically, substituting small amounts of Mn with Cu helps in stabilizing the tetragonal phase and the crossover from the orthorhombic to tetragonal phase for Cu 1+x Mn 1−x As lies somewhere be-tween x = 0.06 − 0.11. 15 Near stoichiometric tetragonal phase can also be synthesized by substituting Mn with As.…”

Section: Introductionmentioning

confidence: 99%

High-resolution diffraction reveals magnetoelastic coupling and coherent phase separation in tetragonal CuMnAs

Karigerasi¹,

Kang²,

Huang³

et al. 2022

Preprint

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Tetragonal CuMnAs was the first antiferromagnet where reorientation of the Néel vector was reported to occur by an inverse spin galvanic effect. A complicating factor in the formation of phase-pure tetragonal CuMnAs is the formation of an orthorhombic phase with nearly the same stoichiometry. Pure-phase tetragonal CuMnAs has been reported to require an excess of Cu to maintain a single phase in traditional solid state synthesis reactions. Here we show that subtle differences in diffraction patterns signal pervasive inhomogeneity and phase separation, even in Cu-rich Cu1.18Mn0.82As. From calorimetry and magnetometry measurements, we identify two transitions corresponding to the Néel temperature (TN ) and an antiferromagnet to weak ferromagnet transition in Cu1.18Mn0.82As and CuMn0.964As1.036. These transitions have clear crystallographic signatures, directly observable in the lattice parameters upon in-situ heating and cooling. The immiscibility and phase separation could arise from a spinoidal decomposition that occurs at high temperatures, and the presence of a ferromagnetic transition near room temperature warrants further investigation of its effect on the electrical switching behavior.

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

Cited by 11 publications

References 28 publications

Ground and Applied-Field-Driven Magnetic States of Antiferromagnets

Ground and Applied-Field-Driven Magnetic States of Antiferromagnets

The study of magnetic topological semimetals by first principles calculations

High-resolution diffraction reveals magnetoelastic coupling and coherent phase separation in tetragonal CuMnAs

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