Driving mechanisms behind the various phases in manganese perovskites revealed by Mn 2p resonance photoemission

TL;DR

This study uses Mn 2p resonance photoemission to explore the complex electronic phase behavior in manganese perovskites, revealing temperature-dependent spectral features linked to phase segregation and Jahn-Teller effects.

Contribution

It provides new experimental insights into the temperature and doping dependence of Mn 3d spectra, highlighting the role of dynamic and static Jahn-Teller effects in phase competition.

Findings

Spectral functions show unusual temperature and doping dependence.

Evidence of microscopic and dynamic phase segregation.

Jahn-Teller effects influence electronic states across phases.

Abstract

Unusual temperature and doping dependence of the Mn 3d spectral functions of manganese perovskites Nd1-xSrxMnO3 has been revealed by the high-resolution Mn 2p-3d resonance photoemission. The temperature-dependent spectra cannot be explained by any theoretical model currently under debate, while showing evidence for a microscopic and dynamic phase segregation. The experimental results strongly suggest that the competition of both the dynamical and static Jahn-Teller effects with ferromagnetic ordering at high and low temperatures, respectively, is responsible for the actual electronic states.