39 citations · 243 across the 16 of their papers we have counts for
16 papers
Coexistence of Antiferromagnetic Cubic and Ferromagnetic Tetragonal Polymorphs in Epitaxial CuMnSb
Anna Ciechan, Piotr Dluzewski, Slawomir Kret +7
High-resolution transmission electron microscopy and superconducting quantum interference device magnetometry shows that epitaxial CuMnSb films exhibit a coexistence of two magneti…
Theory of the coupling of transition metal impurities with free carriers in ZnO
Anna Ciechan, Piotr Bogusławski
The exchange coupling between the spins of band carriers and of transition metal (TM) dopants ranging from Ti to Cu in ZnO is studied within the density functional theory.…
Electronic properties of BiSe dopped by transition metal (Mn, Fe, Co, or Ni) ions
Andrzej Ptok, Konrad Jerzy Kapcia, Anna Ciechan
Topological insulators are characterized by the existence of band inversion and the possibility of the realization of surface states. Doping with a magnetic atom, which is a source…
Transition metal ions in ZnO: effects of intrashell Coulomb repulsion on electronic properties
A. Ciechan, P. Bogusławski
Electronic structure of the transition metal (TM) dopants in ZnO is calculated by first principles approach. Analysis of the results is focused on the properties determined by the…
Calculated optical properties of Co in ZnO: internal and ionization transitions
A. Ciechan, P. Bogusławski
Previous luminescence and absorption experiments in Co-doped ZnO revealed two ionization and one intrashell transition of electrons. Those optical properties…
Metastability of Mn in ZnO driven by strong (Mn) intrashell Coulomb repulsion: experiment and theory
A. Ciechan, H. Przybylińska, P. Bogusławski +5
Depopulation of the Mn state in ZnO:Mn upon illumination, monitored by quenching of the Mn EPR signal intensity, was observed at temperatures below 80~K. Mn ph…
Fe dopant in ZnO: 2+ vs 3+ valency and ion-carrier s,p-d exchange interaction
J. Papierska, A. Ciechan, P. Bogusławski +16
Dopants of transition metal ions in II-VI semiconductors exhibit native 2+ valency. Despite this, 3+ or mixed 3+/2+ valency of iron ions in ZnO was reported previously. Several con…
Magnetism and Superconductivity of S-substituted FeTe
A. Ciechan, M. J. Winiarski, M. Samsel-Czekała
The influence of a partial substitution with sulphur into Te sites on the crystal, electronic and magnetic structures of FeTe is investigated by DFT calculations. The results revea…
Electronic structure of ruthenium-doped iron chalcogenides
M. J. Winiarski, M. Samsel-Czekała, A. Ciechan
The structural and electronic properties of hypothetical RuFeSe and RuFeTe systems have been investigated from first principles within the density functiona…
Strain effects on electronic structure and superconductivity in the iron telluride
M. J. Winiarski, M. Samsel-Czekała, A. Ciechan
The influence of tensile strain in the ab-plane on crystal and electronic structure of FeTe has been studied ab initio. In superconducting FeSe the Fermi surface nesting with a vec…
Magnetic phase transitions and superconductivity in strained FeTe
A. Ciechan, M. J. Winiarski, M. Samsel-Czekała
The influence of hydrostatic pressure and ab-plane strain on the magnetic structure of FeTe is investigated from first principles. The results of calculations reveal a phase transi…
Strain effects on the electronic structure of the FeSe0.5Te0.5 superconductor
M. J. Winiarski, M. Samsel-Czekała, A. Ciechan
The electronic structure of the strained FeSe0.5Te0.5 superconductor has been investigated from first principles. Our calculation results indicate that the influence of hydrostatic…
Strain effects on electronic structure of the iron selenide superconductor
M. J. Winiarski, M. Samsel-Czekała, A. Ciechan
The influence of various strains on crystal and electronic structures of superconducting FeSe has been studied ab initio. We consider changes in the Fermi surface nesting with a ve…
The substitution effects on electronic structure of iron selenide superconductors
A. Ciechan, M. J. Winiarski, M. Samsel-Czekała
The influence of a partial substitution with S, Te, Co, Ni and Cu atoms on the electronic structure of the FeSe superconductor has been investigated within the density functional t…
The Pressure Effects on Electronic Structure of Iron Chalcogenide Superconductors FeSeTe
A. Ciechan, M. J. Winiarski, M. Samsel-Czekała
We study the electronic structure of iron-based superconductors FeSeTe within the density functional theory. We pay particular attention to the pressure effects on the…
Interorbital pair scattering in clean and impure superconductors
Anna Ciechan, Karol I. Wysokinski
The calculations of the local and global properties of two band superconductors have been presented with particular attention to the role of the inter-orbital scattering of pairs.…