Abstract
We report measurements of the de Haas–van Alphen (dHvA) oscillation and a band structure calculation for the pnictide superconductor BaNi 2 P 2 , which is isostructural to BaFe 2 As 2 , the mother compound of the iron-pnictide high- T c superconductor (Ba 1- x K x )Fe 2 As 2 . Six dHvA-frequency branches with frequencies up to ∼8 kT were observed, and they are in excellent agreement with results of the band-structure calculation. The determined Fermi surface is large, enclosing about one electron and hole per formula unit, and three-dimensional. This is in contrast to the small two-dimensional Fermi surface expected for the iron-pnictide high- T c superconductors. The mass enhancement is about two.
Highlights
We report measurements of the de Haas–van Alphen oscillation and a band structure calculation for the pnictide superconductor BaNi2 P2, which is isostructural to BaFe2 As2, the mother compound of the iron-pnictide high-Tc superconductor (Ba1x Kx )Fe2 As2
The superconducting transition temperature Tc has quickly been raised to 43 K by the application of pressure4) and to 54 – 56 K by the use of high-pressure synthesis and/or rare-earth/actinoid substitution.5–8) Different crystal structures have been found to be compatible with this new type of high-temperature superconductivity: (Ba1x Kx )Fe2 As2 (Tc 1⁄4 38 K),9) -FeSe (Tc 1⁄4 8 K),10) and LiFeAs (Tc 1⁄4 18 K),11) for example, -FeSe is not a pnictide
We have initiated a fermiology study of iron and nickel pnictides, and here, we report the first results, namely, the results of de Haas
Summary
We report measurements of the de Haas–van Alphen (dHvA) oscillation and a band structure calculation for the pnictide superconductor BaNi2 P2 , which is isostructural to BaFe2 As2 , the mother compound of the iron-pnictide high-Tc superconductor (Ba1x Kx )Fe2 As2 . Six dHvA-frequency branches with frequencies up to 8 kT were observed, and they are in excellent agreement with results of the band-structure calculation. This is in contrast to the small two-dimensional Fermi surface expected for the iron-pnictide high-Tc superconductors.
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