Structure and magnetism of the β-Mn–Co solid-solution phase

Karlsen, O. B.; Kjekshus, A.; Fjellvåg, Helmer; Vidya, R.; Hauback, B. C.

doi:10.1016/j.jallcom.2008.09.011

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…The β-Mn structure is primitive cubic (space group P 4 1 32), with a unit cell containing 20 Mn atoms divided over two inequivalent crystallographic sites (8c and 12d) [4]. Neutron diffraction reveals that Co substitutes almost entirely onto the 8c site [10]. We will show that all our data can be explained in a model in which the 8c site is non-magnetic, as has already been proposed for elemental β-Mn [6,11].…”

supporting

confidence: 69%

β-Mn: Emergent Simplicity in a Complex Structure

Paddison,

Stewart,

Manuel

et al. 2013

Preprint

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We investigate low-temperature spin correlations in the metallic frustrated magnet β-MnCo. Single-crystal polarised-neutron scattering experiments reveal the persistence of highly-structured magnetic diffuse scattering and the absence of periodic magnetic order to T = 0.05 K. We employ reverse Monte Carlo refinements and mean-field theory simulations to construct a simple effective Hamiltonian which accounts for the magnetic scattering. The interactions we identify describe an emergent spin structure which mimics the triangular lattice antiferromagnet. The observation of a simple collective magnetic state in a complicated crystal structure is surprising because it reverses the established paradigm of elaborate emergent states arising from many-body interactions on simple lattices. We suggest that structural complexity may provide a route to realising new states of correlated quantum matter.

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supporting

confidence: 69%

β-Mn: Emergent Simplicity in a Complex Structure

Paddison,

Stewart,

Manuel

et al. 2013

Preprint

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“…In a β-Mn structure, the unit cell contains 20 atoms which are divided over two non-equivalent crystallographic sites in Wyckoff positions 8c and 12d. While Mn atoms occupy both the sites in pure β-Mn structure, in the doped β-Mn alloys magnetic atoms like Fe or Co occupy the 8c sites and non-magnetic ones like Al or Sn replace the Mn atoms at the 12d sites respectively [14][15][16][17]. B-SEM micrographs, shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Structural and magnetic properties of Mn50Fe50−xSnx (x=10, 15 and 20) alloys

Ghosh

Agarwal

Mukhopadhyay

2016

Journal of Magnetism and Magnetic Materials

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“…Linear regression of the calculated cell energies vs. the number of non-Co atoms on the 8c atoms gives a rough estimate of the energy penalty associated with these sorts of anti-site defects. In Co 10 Zn 10 , this penalty is 516 (20) meV per Zn atom moved onto the 8c site. In Co 8 Zn 9 Mn 3 , the penalty is 210 (20) meV/Mn atom on the 8c site and 540 (30) meV/Zn atom on the 8c site.…”

Section: B Energetics Of Site Preferencesmentioning

confidence: 99%

“…In Co 10 Zn 10 , this penalty is 516 (20) meV per Zn atom moved onto the 8c site. In Co 8 Zn 9 Mn 3 , the penalty is 210 (20) meV/Mn atom on the 8c site and 540 (30) meV/Zn atom on the 8c site.…”

Section: B Energetics Of Site Preferencesmentioning

confidence: 99%

“…β-Mn itself is proposed to show a spin liquid state [19], a property which is driven by geometric frustration in the 12d sublattice. Certain substitutions into β-Mn drive the system into a spin-glass with antiferromagnetic correlations [19,20], while nanoparticles of -Co, which have β-Mn structure, appear to be ferromagnetic [21]. Other compositions include the superconductors Li 2 (Pt/Pd) 3 B [22] and Rh 2 Mo 3 N [23].…”

Section: Introductionmentioning

confidence: 99%

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Deciphering structural and magnetic disorder in the chiral skyrmion host materials Co$_x$Zn$_y$Mn$_z$ ($x+y+z=20$)

Bocarsly,

Heikes,

Brown

et al. 2018

Preprint

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CoxZnyMnz (x + y + z = 20) compounds crystallizing in the chiral β-Mn crystal structure are known to host skyrmion spin textures even at elevated temperatures. As in other chiral cubic skyrmion hosts, skyrmion lattices in these materials are found at equilibrium in a small pocket just below the magnetic Curie temperature. Remarkably, CoxZnyMnz compounds have also been found to host metastable non-equilibrium skyrmion lattices in a broad temperature and field range, including down to zero-field and low temperature. This behavior is believed to be related to disorder present in the materials. Here, we use neutron and synchrotron diffraction, density functional theory calculations, and DC and AC magnetic measurements, to characterize the atomic and magnetic disorder in these materials. We demonstrate that Co has a strong site-preference for the diamondoid 8c site in the crystal structure, while Mn tends to share the geometrically frustrated 12d site with Zn, due to its ability to develop a large local moment on that site. This magnetism-driven site specificity leads to distinct magnetic behavior for the Co-rich 8c sublattice and the Mn on the 12d sublattice. The Co-rich sublattice orders at high temperatures (compositionally tunable between 210 K and 470 K) with a moment around 1 µB/atom and maintains this order to low temperature. The Mn-rich sublattice holds larger moments (about 3 µB) which remain fluctuating below the Co moment ordering temperature. At lower temperature, the fluctuating Mn moments freeze into a reentrant disordered cluster-glass state with no net moment, while the Co moments maintain order. This two-sublattice behavior allows for the observed coexistence of strong magnetic disorder and ordered magnetic states such as helimagnetism and skyrmion lattices.

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Structure and magnetism of the β-Mn–Co solid-solution phase

Cited by 12 publications

References 25 publications

β-Mn: Emergent Simplicity in a Complex Structure

β-Mn: Emergent Simplicity in a Complex Structure

Structural and magnetic properties of Mn50Fe50−xSnx (x=10, 15 and 20) alloys

Deciphering structural and magnetic disorder in the chiral skyrmion host materials Co$_x$Zn$_y$Mn$_z$ ($x+y+z=20$)

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