Abstract
Evaporated single-phase A15 ${\mathrm{Nb}}_{3}$Ir films were irradiated at room temperature with protons and helium ions to study the influence of the induced defect structures determined by x-ray diffraction measurements on the superconducting transition temperature ${T}_{c}$. A reduction in ${T}_{c}$ from 2.1 to 1.8 K was observed for energies deposited into nuclear collisions below 1 eV/atom. Beyond this threshold ${T}_{c}$ increased and revealed values above the initial transition temperature of the unirradiated films depending on the irradiation conditions: 2.8 K for proton and 3.7 K for helium-ion irradiation. The changes in ${T}_{c}$ were accompanied by a decrease of the Bragg-Williams long-range order parameter, a defect structure consisting of static displacements of the lattice atoms with average rms amplitudes in the range of 0.005 to 0.009 nm, and by partial amorphization. The maximum ${T}_{c}$ value of 5.7 K was determined in totally amorphized films. Both the depressions and enhancements in ${T}_{c}$ can be explained by changes of the electronic density of states at the Fermi energy due to smearing effects.
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