TY - JOUR

T1 - Impact of annealing and hydrogenation on the superconducting transition temperature of (TiNbMoTaW)Nx high entropy alloy nitride films

AU - Pristáš, Gabriel

AU - Gruber, Georg

AU - Bačkai, Július

AU - Košuth, Filip

AU - Kölbl, Lukas

AU - Bures, Radoven

AU - Fáberová, Mária

AU - Gabáni, Slavomír

AU - Onufriienko, Oleksandr

AU - Vorobiov, Serhii

AU - Mitterer, Christian

AU - Flachbart, Karol

N1 - Publisher Copyright: © 2025 Elsevier Masson SAS

PY - 2025/2/1

Y1 - 2025/2/1

N2 - Very recently it was shown that incorporation of nitrogen into Ti 0.2Nb 0.2Mo 0.2Ta 0.2W 0.2 high-entropy alloy films leads to a considerable superconducting transition temperature T C enhancement in corresponding (TiNbMoTaW) 1.0N x nitrides. Here we report, independently, about the impact of subsequent annealing and the influence of additional hydrogen incorporation on these films, which should lead to a further enhancement of T C. However, the expected T C increase was not observed, on the contrary, both annealing of films at 800 °C in vacuum and incorporation of hydrogen into these films led to a reduction of T C. Analysis of the results shows that in case of annealing this is related to nitrogen release from the films, in case of hydrogenation to reductions of the density of states at the Fermi level and of the electron-phonon interaction.

AB - Very recently it was shown that incorporation of nitrogen into Ti 0.2Nb 0.2Mo 0.2Ta 0.2W 0.2 high-entropy alloy films leads to a considerable superconducting transition temperature T C enhancement in corresponding (TiNbMoTaW) 1.0N x nitrides. Here we report, independently, about the impact of subsequent annealing and the influence of additional hydrogen incorporation on these films, which should lead to a further enhancement of T C. However, the expected T C increase was not observed, on the contrary, both annealing of films at 800 °C in vacuum and incorporation of hydrogen into these films led to a reduction of T C. Analysis of the results shows that in case of annealing this is related to nitrogen release from the films, in case of hydrogenation to reductions of the density of states at the Fermi level and of the electron-phonon interaction.

KW - Annealing

KW - High entropy alloy nitrides

KW - Hydrogenation

KW - Superconductivity

KW - Transition temperature

UR - http://www.scopus.com/inward/record.url?scp=85216641099&partnerID=8YFLogxK

U2 - 10.1016/j.solidstatesciences.2025.107851

DO - 10.1016/j.solidstatesciences.2025.107851

M3 - Article

VL - 161.2025

SP - 1

EP - 7

JO - Solid State Sciences : SSS

JF - Solid State Sciences : SSS

SN - 1293-2558

IS - March

M1 - 107851

ER -