Nanocriticality in the magnetic phase transition of CoO nanoparticles

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  • Machteld E. Kamminga
  • Jonas Okkels Birk
  • Jari Hjøllum
  • Jacobsen, Henrik
  • Jakob Lass
  • Thorbjørn L. Koch
  • Niels B. Christensen
  • Christof Niedermayer
  • Lukas Keller
  • Luise Theil Kuhn
  • Elisabeth T. Ulrikkeholm
  • Erik Brok
  • Cathrine Frandsen
  • Lefmann, Kim

The universal theory of critical phase transitions describes the critical behavior at second-order phase transitions in infinitely large systems. With the increased contemporary interest in nanoscale materials, we investigated CoO nanoparticles by means of neutron scattering and found how the theory of critical phenomena breaks down in the nanoscale regime. Using CoO as a model system, we have identified a size-dependent nanocritical temperature region close to the antiferromagnetic phase transition where the magnetic correlation length of the nanoparticles converges to a constant value, which is significantly smaller than that of the saturated state found at low temperatures. This is in clear contrast to the divergence around TN observed for bulk systems. Our finding of nanocriticality in the magnetic phase transition is of great importance for the understanding of phase transitions at the nanoscale.

OriginalsprogEngelsk
Artikelnummer064424
TidsskriftPhysical Review B
Vol/bind107
Udgave nummer6
Antal sider6
ISSN2469-9950
DOI
StatusUdgivet - 2023

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© 2023 authors. Published by the American Physical Society.

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