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La3Co and La3Ni are reported superconductors with transition temperatures of 4.5 and 6 K, respectively. Here, we reinvestigate the physical properties of these two intermetallic compounds with magnetic susceptibility χ, specific heat Cp and electrical resistivity ρ measurements down to 1.9 K. Although bulk superconductivity is confirmed in La3Co, as observed previously, only a trace of it is found in La3Ni, indicating that the superconductivity in La3Ni originates from an impurity phase. Superconducting state parameters for La3Co, including lower and upper critical fields and the superconducting gap, are estimated. Results of the theoretical calculations of the electronic structure for both materials are also presented, and comparison of the Fermi level location in La3Co versus La3Ni explains its larger superconducting Tc. A major discrepancy between band structure calculations and the experimentally measured Sommerfeld coefficient is found. The measured electronic density of states is about 2.5 times larger than the theoretical value for La3Co. This effect cannot be explained by the electron-phonon interaction alone. Renormalization of γ, as well as an ∼T2 behavior of the resistivity, suggests the presence of spin fluctuations in both systems.
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Autorzy (7)
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B. Wiendlocha
- Akademia Górniczo-Hutnicza Wydział Fizyki i Informatyki Stosowanej
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Filip Ronning
- Los Alamos National Laboratory -
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuł w czasopiśmie wyróżnionym w JCR
- Opublikowano w:
-
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
nr 528,
strony 73 - 83,
ISSN: 0921-4534 - Język:
- angielski
- Rok wydania:
- 2016
- Opis bibliograficzny:
- Strychalska J., Roman M., Sobczak Z., Wiendlocha B., Winiarski M., Ronning F., Klimczuk T.: Physical properties and electronic structure of La3Co and La3Ni intermetallic superconductors// PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS. -Vol. 528, (2016), s.73-83
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.physc.2016.07.017
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 160 razy
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