Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2

Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2

Abstract Using density-functional theory, we investigate the electronic, magnetic, and hyperfine-interaction properties of the 112-type iron-pnictide compound $${\hbox {EuFeAs}}_2$$ EuFeAs 2 , which is isostructural to the high-temperature iron-based superconductor $${\hbox {Ca}}_{1-x}{\hbox {La}}_x...

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Autores principales: Farshad Nejadsattari, Zbigniew M. Stadnik
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Publicado: Nature Portfolio 2021
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spelling oai:doaj.org-article:c51004f0a3c740228da11bcda5219adb2021-12-02T14:58:19ZSpin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 210.1038/s41598-021-91301-42045-2322https://doaj.org/article/c51004f0a3c740228da11bcda5219adb2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91301-4https://doaj.org/toc/2045-2322Abstract Using density-functional theory, we investigate the electronic, magnetic, and hyperfine-interaction properties of the 112-type iron-pnictide compound $${\hbox {EuFeAs}}_2$$ EuFeAs 2 , which is isostructural to the high-temperature iron-based superconductor $${\hbox {Ca}}_{1-x}{\hbox {La}}_x{\hbox {FeAs}}_2$$ Ca 1 - x La x FeAs 2 . We show that the band structure of $${\hbox {EuFeAs}}_2$$ EuFeAs 2 is similar to that of the 112-type compounds’ family, with hole-like and electron-like bands at the Brillouin-zone center and corners, respectively. We demonstrate that the bands near the Fermi level originate mainly from the Fe atoms. The presence of a mixture of ionic and covalent bonding is predicted from the charge-density and atom-resolved density-of-states calculations. There is good agreement between the calculated hyperfine-interaction parameters with those obtained from the $$^{57}$$ 57 Fe and $$^{151}$$ 151 Eu Mössbauer measurements. The spatial distribution of atoms in $${\hbox {EuFeAs}}_2$$ EuFeAs 2 leads to an in-plane 2D magnetism. Moreover, ab-initio calculations predict the compound’s magnetic moment and the magnetic moments of each constituent atom. Also, the density of states profile provides insight into the relative magnitude of these moments. Electronic structure calculations and Fermi surface topology reveal various physical and chemical properties of $${\hbox {EuFeAs}}_2$$ EuFeAs 2 . Valence electron density maps indicate the co-existence of a wide range of chemical bonds in this system, and based on structural properties, the transport characteristics are deduced and discussed. A thorough analysis of the atomic structure of $${\hbox {EuFeAs}}_2$$ EuFeAs 2 and its role in the bond formation is presented.Farshad NejadsattariZbigniew M. StadnikNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Farshad Nejadsattari
Zbigniew M. Stadnik
Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2
description Abstract Using density-functional theory, we investigate the electronic, magnetic, and hyperfine-interaction properties of the 112-type iron-pnictide compound $${\hbox {EuFeAs}}_2$$ EuFeAs 2 , which is isostructural to the high-temperature iron-based superconductor $${\hbox {Ca}}_{1-x}{\hbox {La}}_x{\hbox {FeAs}}_2$$ Ca 1 - x La x FeAs 2 . We show that the band structure of $${\hbox {EuFeAs}}_2$$ EuFeAs 2 is similar to that of the 112-type compounds’ family, with hole-like and electron-like bands at the Brillouin-zone center and corners, respectively. We demonstrate that the bands near the Fermi level originate mainly from the Fe atoms. The presence of a mixture of ionic and covalent bonding is predicted from the charge-density and atom-resolved density-of-states calculations. There is good agreement between the calculated hyperfine-interaction parameters with those obtained from the $$^{57}$$ 57 Fe and $$^{151}$$ 151 Eu Mössbauer measurements. The spatial distribution of atoms in $${\hbox {EuFeAs}}_2$$ EuFeAs 2 leads to an in-plane 2D magnetism. Moreover, ab-initio calculations predict the compound’s magnetic moment and the magnetic moments of each constituent atom. Also, the density of states profile provides insight into the relative magnitude of these moments. Electronic structure calculations and Fermi surface topology reveal various physical and chemical properties of $${\hbox {EuFeAs}}_2$$ EuFeAs 2 . Valence electron density maps indicate the co-existence of a wide range of chemical bonds in this system, and based on structural properties, the transport characteristics are deduced and discussed. A thorough analysis of the atomic structure of $${\hbox {EuFeAs}}_2$$ EuFeAs 2 and its role in the bond formation is presented.
format article
author Farshad Nejadsattari
Zbigniew M. Stadnik
author_facet Farshad Nejadsattari
Zbigniew M. Stadnik
author_sort Farshad Nejadsattari
title Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2
title_short Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2
title_full Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2
title_fullStr Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2
title_full_unstemmed Spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {EuFeAs}_2$$ EuFeAs 2
title_sort spin polarized density functional theory calculations of the electronic structure and magnetism of the 112 type iron pnictide compound $$\hbox {eufeas}_2$$ eufeas 2
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/c51004f0a3c740228da11bcda5219adb
work_keys_str_mv AT farshadnejadsattari spinpolarizeddensityfunctionaltheorycalculationsoftheelectronicstructureandmagnetismofthe112typeironpnictidecompoundhboxeufeas2eufeas2
AT zbigniewmstadnik spinpolarizeddensityfunctionaltheorycalculationsoftheelectronicstructureandmagnetismofthe112typeironpnictidecompoundhboxeufeas2eufeas2
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