German Samolyuk

Influence of chemical disorder on energy dissipation and defect evolution in concentrated solid solution alloys

A grand challenge in materials research is to understand complex electronic correlation and non-equilibrium atomic interactions, and how such intrinsic properties and dynamic processes affect energy transfer and defect evolution in irradiated materials. Here we report that chemical disorder, with an increasing number of principal elements and/or altered concentrations of specific elements, in single-phase concentrated solid solution alloys can lead to substantial reduction in electron mean free path and orders of magnitude decrease in electrical and thermal conductivity. The subsequently slow energy dissipation affects defect dynamics at the early stages, and consequentially may result in less deleterious defects. Suppressed damage accumulation with increasing chemical disorder from pure nickel to binary and to more complex quaternary solid solutions is observed. Understanding and controlling energy dissipation and defect dynamics by altering alloy complexity may pave the way for new design principles of radiation-tolerant structural alloys for energy applications.

Electronic structure and magnetic exchange coupling in ferromagnetic full Heusler alloys

Density-functional studies of the electronic structures and exchange interaction parameters have been performed for a series of ferromagnetic full Heusler alloys of general formula

Anisotropy of the iron pnictide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0.074 , T c = 23 K )

{\mathrm{Co}}_{2}\mathrm{Mn}Z

Anisotropic three-dimensional magnetism in CaFe2As2

(Z=\mathrm{Ga},\mathrm{Si},\mathrm{Ge},\mathrm{Sn})

Three- to two-dimensional transition of the electronic structure in CaFe2As2: a parent compound for an iron arsenic high-temperature superconductor.

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Resistivity anisotropy of A Fe 2 As 2 ( A = Ca , Sr, Ba): Direct versus Montgomery technique measurements

{\mathrm{Rh}}_{2}\mathrm{Mn}Z

Kinetics of formation of twinned structures under L10-type orderings in alloys

(Z=\mathrm{Ge},\mathrm{Sn},\mathrm{Pb})

Features of primary damage by high energy displacement cascades in concentrated Ni-based alloys

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