Role of long range ferromagnetic order in the electronic structure of Sr$_{1-x}$Ca$_x$RuO$_3$

TL;DR

This study uses high resolution photoemission spectroscopy to explore how long range ferromagnetic order influences the electronic structure of Sr$_{1-x}$Ca$_x$RuO$_3$, revealing notable spectral changes linked to ferromagnetism.

Contribution

It demonstrates the impact of ferromagnetic order on electronic structure and highlights temperature-dependent surface spectral modifications in CaRuO$_3$.

Findings

Bulk spectra show large decrease in coherent feature in ferromagnetic samples.

Surface spectra of CaRuO$_3$ exhibit temperature-induced modifications.

Structural changes may influence surface spectral behavior.

Abstract

We investigate the role of long range ferromagnetic order in the electronic structure of Sr$_{1-x}$Ca$_x$RuO$_3$ using high resolution photoemission spectroscopy. SrRuO$_3$ is a ferromagnetic metal but isostructural, isoelectronic CaRuO$_3$ is an enhanced paramagnet. Surface spectra of CaRuO$_3$ exhibit temperature induced modifications. This is not significant in other compositions. This may be attributed to the structural changes observed in previous studies. Interestingly, the bulk spectra reveal unusual spectral changes exhibiting large decrease in the coherent feature intensity corresponding to only ferromagnetic samples, although the Ru moment is very similar in all the compositions.