Evidence for magnetic clusters in BaCoO$_3$
V. Pardo, J. Rivas, D. Baldomir, M. Iglesias, P. Blaha, K. Schwarz,, and J.E. Arias
TL;DR
This paper investigates the magnetic behavior of BaCoO₃, proposing it consists of noninteracting ferromagnetic clusters that explain its superparamagnetic and paramagnetic properties across different temperature ranges.
Contribution
It introduces a model of noninteracting ferromagnetic clusters in BaCoO₃ supported by experimental and ab initio theoretical analysis.
Findings
Clusters are approximately 1.2 nm in diameter.
Superparamagnetic behavior occurs above 50 K.
Paramagnetism appears above 250 K.
Abstract
Magnetic properties of the transition metal oxide BaCoO are analyzed on the basis of the experimental and theoretical literature available via ab inito calculations. These can be explained by assuming the material to be formed by noninteracting ferromagnetic clusters of about 1.2 nm in diameter separated by about 3 diameters. Above about 50 K, the so-called blocking temperature, superparamagnetic behavior of the magnetic clusters occurs and, above 250 K, paramagnetism sets in.
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