First 2D-ACAR Measurements on Cu with the new Spectrometer at TUM

TL;DR

This paper reports the first 2D-ACAR measurements on copper using a new spectrometer at TUM, demonstrating the technique's effectiveness in reconstructing the Fermi surface with minimal projections.

Contribution

First implementation of 2D-ACAR measurements on copper with a new spectrometer, validating data processing and Fermi surface reconstruction methods.

Findings

Measurements agree well with theoretical calculations

Fermi surface reconstructed with only three projections

Demonstrates the spectrometer's capability for electronic structure analysis

Abstract

The two-dimensional measurement of the angular correlation of the positron annihilation radiation (2D-ACAR) is a powerful tool to investigate the electronic structure of materials. Here we report on the first results obtained with the new 2D-ACAR spectrometer at the Technische Universit\"at M\"unchen (TUM). To get experience in processing and interpreting 2D-ACAR data, first measurements were made on copper. The obtained data are treated with standard procedures and compared to theoretical calculations. It is shown that the measurements are in good agreement with the calculations and that the Fermi surface can be entirely reconstructed using three projections only.