Superconductivity in LiGa2Ir Heusler type compound with VEC = 16 - Publikacja - MOST Wiedzy

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Superconductivity in LiGa2Ir Heusler type compound with VEC = 16

Abstrakt

Polycrystalline LiGa2Ir has been prepared by a solid state reaction method. A Rietveld refnement of powder x-ray difraction data confrms 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 confrmed by detailed heat capacity studies. The measurements indicate that LiGa2Ir is a weak-coupling type-II superconductor (e–p = 0.57, C/γTc= 1.4). Electronic structure, lattice dynamics, and the electron–phonon interaction are studied from frst 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 specifc heat. The calculated electron–phonon coupling constant e–p = 0.68 confrms 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.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
Scientific Reports nr 11,
ISSN: 2045-2322
Język:
angielski
Rok wydania:
2021
Opis bibliograficzny:
Górnicka K., Kuderowicz G., Winiarski M., Wiendlocha B., Klimczuk T.: Superconductivity in LiGa2Ir Heusler type compound with VEC = 16// Scientific Reports -Vol. 11,iss. 1 (2021),
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1038/s41598-021-95944-1
Weryfikacja:
Politechnika Gdańska

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