Local Observation of the Site Occupancy of Mn in a MnFePSi Compound

Neish, M. J.; Oxley, Mark P.; Guo, Jing; Sales, B. C.; Allen, L. J.; Chisholm, Matthew F.

doi:10.1103/physrevlett.114.106101

Cited by 23 publications

(17 citation statements)

References 33 publications

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“…The nuclear and electronic contributions are independent, and hence the zero-field μSR spectra measured above T C are fitted by a product of Eqs. (3) and (4). Fits for both compounds show that muon diffusion is present above 325 K, while it becomes negligible below 325 K. Muon diffusion is a thermally-activated process.…”

Section: Muon-spin Relaxation Analysismentioning

confidence: 99%

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Short-range magnetic correlations and spin dynamics in the paramagnetic regime of(Mn,Fe)2(P,Si)

et al. 2016

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The spatial and temporal correlations of magnetic moments in the paramagnetic regime of (Mn,Fe) 2 (P,Si) have been investigated by means of polarized neutron diffraction and muon-spin relaxation techniques. Shortrange magnetic correlations are present at temperatures far above the ferromagnetic transition temperature (T C ). This leads to deviations of paramagnetic susceptibility from Curie-Weiss behavior. These short-range magnetic correlations extend in space, slow down with decreasing temperature, and finally develop into long-range magnetic order at T C .

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Section: Muon-spin Relaxation Analysismentioning

confidence: 99%

“…1. Fe atoms preferentially occupy the tetrahedral 3f site, while Mn prefers the pyramidal 3g site [1,4]. The nature of the ferromagnetic (FM) state, e.g., the magnitude and orientation of the magnetic moments, has been studied intensively using neutron diffraction techniques [1,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Short-range magnetic correlations and spin dynamics in the paramagnetic regime of(Mn,Fe)2(P,Si)

et al. 2016

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“…Neutron diffraction [26,27], atomic-scale scanning transmission electron microscopy [28] and density functional theory (DFT) calculations [23,29,31] indicate a preferential occupation of the two 2 transition-metal atoms in the hexagonal structure. Mn prefers the 3g site with five non-metal nearest neighbors forming a square pyramid, while Fe favors the 3f site surrounded by four non-metal coordination atoms forming a tetrahedron.…”

Section: Introductionmentioning

confidence: 98%

Spin correlations in (Mn,Fe)2(P,Si) magnetocaloric compounds above Curie temperature

Miao

Caron

Gubbens

et al. 2016

Journal of Science: Advanced Materials and Devices

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a b s t r a c tThe longitudinal-field muon-spin relaxation (LF-mSR) technique was employed to study the spin correlations in (Mn,Fe) 2 (P,Si) compounds above the ferromagnetic transition temperature (T C ). The (Mn,Fe) 2 (P,Si) compound under study is found to show itinerant magnetism. The standard deviation of the magnetic field distribution of electronic origin increases with a decrease in temperature, which is attributed to the development of spin correlations. The anomalously low magnetic fluctuation rate is suggested to be another signature of the spin correlations. The development of pronounced magnetic fluctuations is in agreement with the observed deviation of the paramagnetic susceptibility from Curie eWeiss behavior. Our study sheds light on the magneto-elastic transition and the mixed magnetism in (Mn,Fe) 2 (P,Si) compounds.

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“…Careful attention to the mixing of signals from neighboring atomic-columns is required to analyze a spectrum at a single point. [10][11][12] These complexities make it difficult to perform quantitative analysis with atomic resolution.…”

mentioning

confidence: 99%

“…[10][11][12] It is difficult to discuss the accuracy of quantified value by STEM-EELS unless one uses the sample of which the compositional ratios at each atomic site are known by precise analysis such as neutron diffraction. Therefore, it is important to obtain the experimental criteria for semi-quantitative analysis of STEM-EELS using model system.…”

mentioning

confidence: 99%

Determination of Elemental Ratio in an Atomic Column by Electron Energy Loss Spectroscopy

et al. 2016

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Atomic-resolution quantification of the elemental ratio of Fe to Mn at the octahedral and tetrahedral sites in brownmillerite Ca2Fe1.07Mn0.93O5 was determined using electron energy-loss spectroscopy combined with aberration-corrected scanning transmission electron microscopy. The combined techniques revealed that oversampling of the spectral imaging data yielded a spatially resolved area that very nearly reflects atomic resolution (∼1.2 Å radius). The average experimental ratios of Fe to Mn within this region were 17.5:82.5 for the octahedral sites and 81.6:18.4 for the tetrahedral sites. The elemental ratio in an octahedral atomic column was successfully extracted by estimating the mixing of signals from nearest neighbor columns. The results indicated that the ratio of Fe to Mn was 13:87 at the octahedral site, which is in good agreement with the results of neutron diffraction analysis. In addition, the uncertainty of experimental results obtained by using an average 1.2 Å radius was less than 10% at octahedral sites, depending on the sample thickness. In contrast, the experimental error due to dechanneling of incident electrons was larger at the tetrahedral sites. This experimental procedure has wide application for determining the spatially resolved composition ratio of elements in perovskite-like compounds.

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Local Observation of the Site Occupancy of Mn in a MnFePSi Compound

Cited by 23 publications

References 33 publications

Short-range magnetic correlations and spin dynamics in the paramagnetic regime of(Mn,Fe)2(P,Si)

Short-range magnetic correlations and spin dynamics in the paramagnetic regime of(Mn,Fe)2(P,Si)

Spin correlations in (Mn,Fe)2(P,Si) magnetocaloric compounds above Curie temperature

Determination of Elemental Ratio in an Atomic Column by Electron Energy Loss Spectroscopy

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