Superconductivity in LiGa2Ir Heusler type compound with VEC = 16

Abstract Polycrystalline LiGa2Ir has been prepared by a solid state reaction method. A Rietveld refinement of powder x-ray diffraction data confirms a previously reported Heusler-type crystal structure (space group Fm-3m, No. 225) with lattice parameter a = 6.0322(1) Å. The normal and superconductin...

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Autores principales:	Karolina Górnicka, Gabriel Kuderowicz, Michał J. Winiarski, Bartłomiej Wiendlocha, Tomasz Klimczuk
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f49e337c0a8249708fe2938f79e7dd4a
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spelling	oai:doaj.org-article:f49e337c0a8249708fe2938f79e7dd4a2021-12-02T19:06:40ZSuperconductivity in LiGa2Ir Heusler type compound with VEC = 1610.1038/s41598-021-95944-12045-2322https://doaj.org/article/f49e337c0a8249708fe2938f79e7dd4a2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95944-1https://doaj.org/toc/2045-2322Abstract Polycrystalline LiGa2Ir has been prepared by a solid state reaction method. A Rietveld refinement of powder x-ray diffraction data confirms a previously reported Heusler-type crystal structure (space group Fm-3m, No. 225) with lattice parameter a = 6.0322(1) Å. The normal and superconducting state properties were studied by magnetic susceptibility, heat capacity, and electrical resistivity techniques. A bulk superconductivity with Tc = 2.94 K was confirmed by detailed heat capacity studies. The measurements indicate that LiGa2Ir is a weak-coupling type-II superconductor ( $${\uplambda }$$ λ e–p = 0.57, $${\Delta }$$ Δ C/ $${\upgamma }$$ γ Tc = 1.4). Electronic structure, lattice dynamics, and the electron–phonon interaction are studied from first principles calculations. Ir and two Ga atoms equally contribute to the Fermi surface with a minor contribution from Li. The phonon spectrum contains separated high frequency Li modes, which are seen clearly as an Einstein-like contribution in the specific heat. The calculated electron–phonon coupling constant $${\uplambda }$$ λ e–p = 0.68 confirms the electron–phonon mechanism for the superconductivity. LiGa2Ir and recently reported isoelectronic LiGa2Rh are the only two known representatives of the Heusler superconductors with the valence electron count VEC = 16.Karolina GórnickaGabriel KuderowiczMichał J. WiniarskiBartłomiej WiendlochaTomasz KlimczukNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Karolina Górnicka Gabriel Kuderowicz Michał J. Winiarski Bartłomiej Wiendlocha Tomasz Klimczuk Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
description	Abstract Polycrystalline LiGa2Ir has been prepared by a solid state reaction method. A Rietveld refinement of powder x-ray diffraction data confirms a previously reported Heusler-type crystal structure (space group Fm-3m, No. 225) with lattice parameter a = 6.0322(1) Å. The normal and superconducting state properties were studied by magnetic susceptibility, heat capacity, and electrical resistivity techniques. A bulk superconductivity with Tc = 2.94 K was confirmed by detailed heat capacity studies. The measurements indicate that LiGa2Ir is a weak-coupling type-II superconductor ( $${\uplambda }$$ λ e–p = 0.57, $${\Delta }$$ Δ C/ $${\upgamma }$$ γ Tc = 1.4). Electronic structure, lattice dynamics, and the electron–phonon interaction are studied from first principles calculations. Ir and two Ga atoms equally contribute to the Fermi surface with a minor contribution from Li. The phonon spectrum contains separated high frequency Li modes, which are seen clearly as an Einstein-like contribution in the specific heat. The calculated electron–phonon coupling constant $${\uplambda }$$ λ e–p = 0.68 confirms the electron–phonon mechanism for the superconductivity. LiGa2Ir and recently reported isoelectronic LiGa2Rh are the only two known representatives of the Heusler superconductors with the valence electron count VEC = 16.
format	article
author	Karolina Górnicka Gabriel Kuderowicz Michał J. Winiarski Bartłomiej Wiendlocha Tomasz Klimczuk
author_facet	Karolina Górnicka Gabriel Kuderowicz Michał J. Winiarski Bartłomiej Wiendlocha Tomasz Klimczuk
author_sort	Karolina Górnicka
title	Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
title_short	Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
title_full	Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
title_fullStr	Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
title_full_unstemmed	Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
title_sort	superconductivity in liga2ir heusler type compound with vec = 16
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f49e337c0a8249708fe2938f79e7dd4a
work_keys_str_mv	AT karolinagornicka superconductivityinliga2irheuslertypecompoundwithvec16 AT gabrielkuderowicz superconductivityinliga2irheuslertypecompoundwithvec16 AT michałjwiniarski superconductivityinliga2irheuslertypecompoundwithvec16 AT bartłomiejwiendlocha superconductivityinliga2irheuslertypecompoundwithvec16 AT tomaszklimczuk superconductivityinliga2irheuslertypecompoundwithvec16
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Superconductivity in LiGa2Ir Heusler type compound with VEC = 16

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