Magnetic Structures and Spin States of NdBaCo2O5

TL;DR

This study investigates the magnetic structures and spin states of NdBaCo2O5 using neutron diffraction, revealing two magnetic transitions and stable high-spin Co states across a broad temperature range.

Contribution

It provides detailed neutron diffraction analysis of NdBaCo2O5, identifying magnetic transitions and confirming high-spin Co states in different magnetic phases.

Findings

Two magnetic transitions at ~360 K and ~250 K

Co ions remain in high spin state below 360 K

G-type antiferromagnetic structure observed at 7 K and 300 K

Abstract

Neutron diffraction studies have been carried out on a single crystal of oxygen-deficient perovskite NdBaCo2O5 in the temperature range of 7-370 K. There have been observed, with decreasing temperature T, two magnetic transitions accompanied with structural changes, to the antiferromagnetic phase at ~360 K and to the charge ordered antiferromagnetic one at ~250 K. We have studied the magnetic structures at 300 K and 7 K. At these temperatures the Co-moments have the so-called G-type antiferromagnetic structure, and Co ions are considered to be in the high spin state over the whole temperature range below TN 360 K irrespective of whether the charge ordering is present or not.