Fermi surface nesting and magnetic structure of ErGa3

TL;DR

This study maps the three-dimensional Fermi surface of ErGa3, revealing nesting properties that correlate with its antiferromagnetic structure, and provides detailed electronic density of states and contributions to specific heat.

Contribution

It presents the first 3D Fermi surface mapping of ErGa3 using 2D ACAR measurements, linking Fermi surface nesting to magnetic ordering.

Findings

Fermi surface exhibits nesting properties consistent with antiferromagnetic structure

Density of states at Fermi energy is 16 states/Ryd/cell

Electronic gamma constant is 2.7 mJ/mole K^2

Abstract

A three dimensional mapping of the Fermi Surface (FS) of the rare-earth compound ErGa3 was determined via measurements of the angular correlation of the electron-positron annihilation radiation. The topology of the electronlike FS does show nesting properties which are consistent with the modulated antiferromagnetic structure of the system. We determine the density of states at the Fermi energy N(EF) and the electronic contribution to the gamma constant to be N(EF)=16 states/Ryd/cell and gamma=2.7 (mJ/mole K^2), respectively. Densities rho(k) of ErGa3 and TmGa3 in the kz=0 and kz=pi/a plane of the Brillouin zone reconstructed from 2D ACAR data. The arrow highlights the nesting feature attributed to TmGa3 and ErGa3 (left and right sides, respectivelty).