Electronic Structure of Charge- and Spin-controlled Sr_{1-(x+y)}La_{x+y}Ti_{1-x}Cr_{x}O_{3}

TL;DR

This study investigates the electronic structure of Sr_{1-(x+y)}La_{x+y}Ti_{1-x}Cr_{x}O_{3} using high-resolution photoemission spectroscopy, revealing how charge and spin states are influenced by doping levels.

Contribution

It provides detailed insights into the relationship between doping levels and electronic/spin states in Sr_{1-(x+y)}La_{x+y}Ti_{1-x}Cr_{x}O_{3}, highlighting controllable spin density.

Findings

Cr 3d state spectral weight is proportional to spin concentration x.

Ti 3d state spectral weight depends on Cr doping, not just carrier concentration y.

Electronic structure near Fermi level involves Cr 3d local and Ti 3d itinerant states.

Abstract

We present the electronic structure of Sr_{1-(x+y)}La_{x+y}Ti_{1-x}Cr_{x}O_{3} investigated by high-resolution photoemission spectroscopy. In the vicinity of Fermi level, it was found that the electronic structure were composed of a Cr 3d local state with the t_{2g}^{3} configuration and a Ti 3d itinerant state. The energy levels of these Cr and Ti 3d states are well interpreted by the difference of the charge-transfer energy of both ions. The spectral weight of the Cr 3d state is completely proportional to the spin concentration x irrespective of the carrier concentration y, indicating that the spin density can be controlled by x as desired. In contrast, the spectral weight of the Ti 3d state is not proportional to y, depending on the amount of Cr doping.