Magnetic phase transitions in PrMn 2O 5: Importance of ion-size threshold size effects in RMn 2O 5 compounds (R = rare earth)

C. Doubrovsky, G. André, A. Gukasov, P. Auban-Senzier, C. R. Pasquier, E. Elkaim, M. Li, M. Greenblatt, F. Damay, P. Foury-Leylekian

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Abstract

A detailed investigation of the thermodynamic, structural, and magnetic properties of high quality polycrystalline PrMn 2O 5 samples are presented. In contrast with members of the RMn 2O 5 family with smaller rare-earth ions, PrMn 2O 5 is not ferroelectric and does not undergo a transition to an incommensurate (q x, 0, q z) magnetic phase: It exhibits two magnetic transitions, corresponding to commensurate magnetic orderings at T 1=25±1 K and T 2=18±1 K. These two magnetic transitions are characterized by two orthogonal propagation vectors q 1=(12,0,0) and q 2=(0,0,12), respectively, which coexist below T 2. The refinement of the neutron data show that Mn3 + order primarily at T 1, following q 1; below T 2, the Mn4 + sublattice orders following q 2.

Original languageEnglish (US)
Article number174417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number17
DOIs
StatePublished - Nov 19 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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