Physical properties and electronic structure of La3Co and La3Ni intermetallic superconductors

Strychalska, J.; Roman, M.; Sobczak, Z.; Wiendlocha, B.; Winiarski, M. J.; Ronning, F.; Klimczuk, T.

doi:10.1016/j.physc.2016.07.017

Title: Physical properties and electronic structure of La₃Co and La₃Ni intermetallic superconductors

Journal Article · Tue Jul 26 00:00:00 EDT 2016 · Physica. C, Superconductivity

DOI:https://doi.org/10.1016/j.physc.2016.07.017· OSTI ID:1458929

^[1]; Roman, M. ^[1]; Sobczak, Z. ^[1];

^[2];

^[1];

^[3]; Klimczuk, T. ^[1]

Gdansk Univ. of Technology (Poland). Faculty of Applied Physics and Mathematics
AGH Univ. of Science and Technology, Krakow (Poland). Faculty of Physics and Applied Computer Science
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

La₃Co and La₃Ni are reported superconductors with transition temperatures of 4.5 and 6 K, respectively. In this work, we reinvestigate the physical properties of these two intermetallic compounds with magnetic susceptibility χ, specific heat C_p 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 T_c. 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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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Centre (Poland); Ministry of Science and Higher Education (Poland)

Grant/Contract Number:: AC52-06NA25396; DEC-2012/07/E/ST3/00584

OSTI ID:: 1458929

Alternate ID(s):: OSTI ID: 1396976

Report Number(s):: LA-UR-16-21372; TRN: US1901526

Journal Information:: Physica. C, Superconductivity, Vol. 528, Issue C; ISSN 0921-4534

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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