Weak Ferromagnetism in LaCo1-xRhxO3: Anomalous Magnetism Emerging between Two Nonmagnetic End Phases

TL;DR

This study investigates the emergence of weak ferromagnetism in LaCo1-xRhxO3, revealing anomalous magnetic behavior between two nonmagnetic end phases, with ferromagnetic transitions observed at low temperatures for specific compositions.

Contribution

It demonstrates the induction of ferromagnetism in LaCo1-xRhxO3 solid solutions and analyzes the spin states and magnetic ordering, highlighting novel magnetic phenomena between nonmagnetic phases.

Findings

Ferromagnetic transition below 15 K for x between 0.1 and 0.4

Magnetic moment remains constant (~3 μB) for 0 < x < 0.5

Magnetic moment decreases rapidly above x = 0.5

Abstract

Magnetization has been measured for polycrystalline samples of LaCo1-xRhxO3 (0 {\leq} x {\leq} 0.9) in order to investigate magnetism induced in the solid solution of two nonmagnetic end phases of LaCoO3 and LaRhO3. It is found that a ferromagnetic transition is observed below 15 K in the range of x from 0.1 to 0.4. The effective Bohr magnetic moment evaluated from the temperature dependence of magnetic susceptibility at around room temperature is independent of x for 0 < x < 0.5 (approximately 3 {\mu}B per formula unit), and rapidly decreases above x = 0.5. On the basis of detailed magnetization measurements, the spin state and magnetic ordering of LaCo1-xRhxO3 are discussed.