Nature of magnetic transitions in MnO, ${Fe}_{z} O$ , CoO, and NiO

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1 December 1983

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 28 (11) , 6542-6544
https://doi.org/10.1103/physrevb.28.6542

Abstract

High-resolution measurements of the magnetic susceptibility

χ

in polycrystalline MnO,

{Fe}_{z} O

(

z = 0.938

), CoO, and NiO, and in stressed (along [111]) NiO crystals near their respective

T_{N}

's are reported. From the behavior of

χ

and

\frac{\partial (χ T)}{\partial T}

vs

ε = \frac{(T - T_{N})}{T_{N}}

for

| ε | < 0.03

, it is found that the transitions to the magnetic state in MnO and

{Fe}_{z} O

are first order, whereas those in CoO and NiO are continuous.

Keywords

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