Temperature dependence of antiferromagnetic susceptibility in ferritin

Details Temperature dependence of antiferromagnetic susceptibility in ferritin Temperature dependence of antiferromagnetic susceptibility in ferritin

2009-02-05

arxiv.org/abs/0902.0929v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures, accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.104405

We show that antiferromagnetic susceptibility in ferritin increases with temperature between 4.2 K and 180 K (i. e. below the N\'{e}el temperature) when taken as the derivative of the magnetization at high fields ($30\times10^4$ Oe). This behavior contrasts with the decrease in temperature previously found, where the susceptibility was determined at lower fields ($5\times10^4$ Oe). At high fields (up to $50 \times10^4$ Oe) the temperature dependence of the antiferromagnetic susceptibility in ferritin nanoparticles approaches the normal behavior of bulk antiferromagnets and nanoparticles considering superantiferromagnetism, this latter leading to a better agreement at high field and low temperature. The contrast with the previous results is due to the insufficient field range used ($< 5 \times10^4$ Oe), not enough to saturate the ferritin uncompensated moment.

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