Iridium 5d -electron driven superconductivity in ThIr3 - Publikacja - MOST Wiedzy

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Iridium 5d -electron driven superconductivity in ThIr3

Abstrakt

A polycrystalline sample of superconducting ThI r 3 was obtained by arc-melting Th and Ir metals. Powder x-ray diffraction revealed that the compound crystalizes in a rhombohedral crystal structure (R-3m, s.g. #166) with the lattice parameters: a = 5.3394 ( 1 ) Å and c = 26.4228 ( 8 ) Å . Normal and superconducting states were studied by magnetic susceptibility, electrical resistivity, and heat capacity measurements. The results showed that ThI r 3 is a type-II superconductor (Ginzburg-Landau parameter κ = 38 ) with the critical temperature T c = 4.41 K . The heat capacity data yielded the Sommerfeld coefficient γ = 17.6 mJ / ( mo l K 2 ) and the Debye temperature Θ D = 169 K . The ratio Δ C / ( γ T c ) = 1.6 , where Δ C stands for the specific heat jump at T c , and the electron–phonon coupling constant λ e − p = 0.74 suggest that ThI r 3 is a moderate-strength superconductor. The experimental studies were supplemented by band structure calculations, which indicated that the superconductivity in ThI r 3 is governed mainly by 5 d states of iridium. The significantly smaller band-structure value of Sommerfeld coefficient as well as the experimentally observed quadratic temperature dependence of resistivity and enhanced magnetic susceptibility suggest the presence of electronic interactions in the system, which compete with superconductivity.

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Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
PHYSICAL REVIEW B nr 100,
ISSN: 2469-9950
Język:
angielski
Rok wydania:
2019
Opis bibliograficzny:
Górnicka K., Das D., Gutowska S., Wiendlocha B., Winiarski M., Klimczuk T., Kaczorowski D.: Iridium 5d -electron driven superconductivity in ThIr3// PHYSICAL REVIEW B -Vol. 100,iss. 21 (2019), s.214514-
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1103/physrevb.100.214514
Weryfikacja:
Politechnika Gdańska

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