H. Sormann
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Accurate bare susceptibilities from full-potential<i>ab initio</i>calculations Open
Electronic susceptibilities are a very popular tool to study electronic and magnetic properties of materials, both in experiment and theory. Unfortunately, the numerical evaluation of even the bare susceptibility, which depends on the comp…
Indirect evidence for strong coupling superconductivity in FeSe under pressure from first-principle calculations Open
Whether the pairing mechanism for superconductivity in iron-based superconductors is of itinerant or local character is a question still debated on. In order to investigate the influence of Fermi surface nesting, we calculate from first-pr…
Modeling the absorption behavior of solar thermal collector coatings utilizing graded α-C:H/TiC layers Open
Wavelength selective coatings are of common use in order to enhance the efficiency of devices heated by radiation such as solar thermal collectors. The use of suitable materials and the optimization of coating layer thicknesses are advisab…
On the reliability of linear band structure methods Open
We discuss an efficiency of various band structure algorithms in determining the Fermi surface (FS) of the paramagnetic ErGa3. The linear muffin-tin orbital (LMTO) in the atomic sphere approximation (ASA) method and three full potential (F…
Many-Body Effects Observed in the Positron Annihilation Experiment Open
This paper is devoted to study many-body effects in the positron annihi-lation experiment, both electron−positron (e–p) and electron–electron (e–e) correlations. Various theories of the e–p interaction in real solids were used to verify th…
Many-body effects observed in the positron annihilation experiment Open
This paper is devoted to study many-body effects in the positron annihilation experiment, both electron-positron (e-p) and electron-electron (e-e) correlations. Various theories of the e-p interaction in real solids were used to verify the…
View article: Electron momentum density in yttrium
Electron momentum density in yttrium Open
A simultaneous analysis of high-resolution directional Compton profiles and\ntwo-dimensional angular correlation of positron annihilation experimental data\nhas been performed by studying both a directional anisotropy of measured\nspectra …
View article: On the reliability of various enhancement theories for a description of electron-positron densities in metals
On the reliability of various enhancement theories for a description of electron-positron densities in metals Open
Four theoretical approaches to calculate momentum densities of electron-positron annihilation pairs (MDAP) in crystalline solids are confronted with 3D densities reconstructed from two-dimensional angular correlation (2D-ACAR) data for cop…
View article: Fermi surface of yttrium
Fermi surface of yttrium Open
Electron-positron momentum densities in Y, reconstructed from two-dimensional angular correlation of annihilation radiation spectra, are compared with the theoretical predictions of fully-relativistic augmented plane-wave calculations. Kno…
Umklapp Components of the Positron Momentum Density Depending on Different Models for the Positron Wave Function Open
In this paper, we present a numerical investigation about the question how sensitively Fourier coefficients of the positron wave function ψ+ react to different (and not too strong) changes of ψ+. In order to obtain general information abou…
Electron-Positron Enhancement in d-Metals Described by the Bloch-Modified Ladder Theory and the Local Density Approximation: a Comparative Study Open
In this paper, we present a preliminary summary of our recent results on the enhancement of the electron-positron annihilation rate in d-band metals based on our recently published optimized quasí-free Bloch-modified 1adder [QF-BML(opt.)]t…
Electronic Structure Seen by Positrons in Extended and Reduced Zone Schemes Open
The influence of the positron on the momentum distribution of annihilation quanta is investigated.Basing on general considerations, we show that a noninteracting positron, which generally reduces electronic densities, may enlarge some part…
Recent Developments of the Bloch-Modified Ladder Theory Open
One of the possible theoretical approaches for desribing the physics of electron-positron pairs in the inhomogeneous electron gas is the so-called "quasi-free" Bloch-modified 1adder theory.Despite the success of this approach, it contains …