57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2

Abstract The EuFe2−xNixAs2 (with 0 ≤ x ≤ 0.4) compounds exhibiting 3d and/or 4f magnetic order were investigated by means of 57Fe and 151Eu Mössbauer spectroscopy. Additionally, results for EuNi2As2 are reported for comparison. It was found that spin-density-wave order of the Fe itinerant moments is...

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Autores principales:	K. Komędera, J. Gatlik, A. Błachowski, J. Żukrowski, D. Rybicki, A. Delekta, M. Babij, Z. Bukowski
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Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/713f284d7f014280a4156b9fe397ff4d
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spelling	oai:doaj.org-article:713f284d7f014280a4156b9fe397ff4d2021-12-02T17:51:06Z57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs210.1038/s41598-021-90657-x2045-2322https://doaj.org/article/713f284d7f014280a4156b9fe397ff4d2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90657-xhttps://doaj.org/toc/2045-2322Abstract The EuFe2−xNixAs2 (with 0 ≤ x ≤ 0.4) compounds exhibiting 3d and/or 4f magnetic order were investigated by means of 57Fe and 151Eu Mössbauer spectroscopy. Additionally, results for EuNi2As2 are reported for comparison. It was found that spin-density-wave order of the Fe itinerant moments is monotonically suppressed by Ni-substitution. However, the 3d magnetic order survives at the lowest temperature up to at least x = 0.12 and it is certainly completely suppressed for x = 0.20. The Eu localized moments order regardless of the Ni concentration, but undergo a spin reorientation with increasing x from alignment parallel to the a-axis in the parent compound, toward c-axis alignment for x > 0.07. Change of the 4f spins ordering from antiferromagnetic to ferromagnetic takes place simultaneously with a disappearance of the 3d spins order what is the evidence of a strong coupling between magnetism of Eu2+ ions and the conduction electrons of [Fe2−xNixAs2]2- layers. The Fe nuclei experience the transferred hyperfine magnetic field due to the Eu2+ ordering for Ni-substituted samples with x > 0.04, while the transferred field is undetectable in EuFe2As2 and for compound with a low Ni-substitution level. It seems that the 4f ferromagnetic component arising from a tilt of the Eu2+ moments to the crystallographic c-axis leads to the transferred magnetic field at the Fe atoms. Superconductivity is not observed down to 1.8 K, although a comparison with 57Fe and 151Eu Mössbauer data for EuFe2As2-based superconductors indicates a similar magnetic structure.K. KomęderaJ. GatlikA. BłachowskiJ. ŻukrowskiD. RybickiA. DelektaM. BabijZ. BukowskiNature 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 K. Komędera J. Gatlik A. Błachowski J. Żukrowski D. Rybicki A. Delekta M. Babij Z. Bukowski 57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2
description	Abstract The EuFe2−xNixAs2 (with 0 ≤ x ≤ 0.4) compounds exhibiting 3d and/or 4f magnetic order were investigated by means of 57Fe and 151Eu Mössbauer spectroscopy. Additionally, results for EuNi2As2 are reported for comparison. It was found that spin-density-wave order of the Fe itinerant moments is monotonically suppressed by Ni-substitution. However, the 3d magnetic order survives at the lowest temperature up to at least x = 0.12 and it is certainly completely suppressed for x = 0.20. The Eu localized moments order regardless of the Ni concentration, but undergo a spin reorientation with increasing x from alignment parallel to the a-axis in the parent compound, toward c-axis alignment for x > 0.07. Change of the 4f spins ordering from antiferromagnetic to ferromagnetic takes place simultaneously with a disappearance of the 3d spins order what is the evidence of a strong coupling between magnetism of Eu2+ ions and the conduction electrons of [Fe2−xNixAs2]2- layers. The Fe nuclei experience the transferred hyperfine magnetic field due to the Eu2+ ordering for Ni-substituted samples with x > 0.04, while the transferred field is undetectable in EuFe2As2 and for compound with a low Ni-substitution level. It seems that the 4f ferromagnetic component arising from a tilt of the Eu2+ moments to the crystallographic c-axis leads to the transferred magnetic field at the Fe atoms. Superconductivity is not observed down to 1.8 K, although a comparison with 57Fe and 151Eu Mössbauer data for EuFe2As2-based superconductors indicates a similar magnetic structure.
format	article
author	K. Komędera J. Gatlik A. Błachowski J. Żukrowski D. Rybicki A. Delekta M. Babij Z. Bukowski
author_facet	K. Komędera J. Gatlik A. Błachowski J. Żukrowski D. Rybicki A. Delekta M. Babij Z. Bukowski
author_sort	K. Komędera
title	57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2
title_short	57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2
title_full	57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2
title_fullStr	57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2
title_full_unstemmed	57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2
title_sort	57fe and 151eu mössbauer studies of 3d-4f spin interplay in eufe2−xnixas2
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/713f284d7f014280a4156b9fe397ff4d
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57Fe and 151Eu Mössbauer studies of 3d-4f spin interplay in EuFe2−xNixAs2

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