Electronic signatures of successive itinerant, magnetic transitions in hexagonal La2Ni7

TL;DR

This study combines ARPES and DFT to investigate how successive magnetic transitions in La2Ni7 influence its electronic structure, revealing significant band reconstructions associated with magnetic ordering.

Contribution

It provides detailed experimental and theoretical insights into the electronic and magnetic properties of La2Ni7 across multiple magnetic transitions, highlighting the effects of magnetic ordering.

Findings

Band structure reconstruction at magnetic transitions

Agreement between ARPES data and DFT calculations

Identification of electron and hole pockets with hexagonal symmetry

Abstract

We use high-resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations to study the electronic and magnetic properties of La2Ni7, an itinerant magnetic system with a series of three magnetic transition temperatures upon cooling, which end in a weak itinerant antiferromagnetic (wAFM) ground state. Our APRES data reveal several electron and hole pockets that have hexagonal symmetry near the $\Gamma$ point. We observe significant reconstruction of the band structure upon successive magnetic transitions at T1 = 61 K, T2 = 57 K and T3 = 42 K. The experimental data are in a reasonable agreement with DFT calculations, demonstrating their applicability to itinerant antiferromagnet systems. Our results detail the effects of magnetic ordering on the electronic structure in a Ni-based weak antiferromagnet.