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The European Physical Journal B

, Volume 70, Issue 3, pp 327–334 | Cite as

Magnetic ground state and the spin-state transitions in YBaCo2O5.5

  • D. P. KozlenkoEmail author
  • Z. Jirák
  • N. O. Golosova
  • B. N. Savenko
Solid State and Materials

Abstract

The crystal and magnetic structure of the perovskite-like, oxygen deficient cobalt oxide YBaCo2O5.5 has been studied by means of neutron and X-ray diffraction in the 10–300 K temperature range. The magnetic ground state is characterized by a coexistence of two distinct antiferromagnetic phases. In the first one, the ionic moments of high-spin Co3+ ions in the pyramidal sites are ordered in a spiral arrangement, while octahedral sites are non-magnetic due to presence of low-spin Co3+ ions. The arrangement in the second phase is collinear of the G-type, with non-zero moments both in pyramidal (high-spin Co3+ ions) and octahedral sites (presumably a mixture of the low- and high-spin states). With increasing temperature, at 260–300 K, the system develops a gradual structural transformation, which is associated with appearance of spontaneous magnetic moment. This process is related to a thermally induced reversion of low- and high-spin states at the octahedral sites to the intermediate-spin Co3+ states, resulting in an insulator-metal transition at TC ≈ TIM ≈ 295 K.

PACS

75.25.+z Spin arrangements in magnetically ordered materials 61.05.fm Neutron diffraction 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • D. P. Kozlenko
    • 1
    Email author
  • Z. Jirák
    • 2
  • N. O. Golosova
    • 1
  • B. N. Savenko
    • 1
  1. 1.Frank Laboratory of Neutron PhysicsJINRDubna Moscow Reg.Russia
  2. 2.Institute of PhysicsPrague 6Czech Republic

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