Crystal and magnetic structures of NdBaCo(2)O(5+delta) (delta similar to 0.75): A neutron diffraction study
authors Khalyavin, DD; Prokhnenko, O; Stusser, N; Sikolenko, V; Efimov, V; Salak, AN; Yaremchenko, AA; Kharton, VV
nationality International
journal PHYSICAL REVIEW B
keywords PHYSICAL-PROPERTIES; POWDER DIFFRACTION; PHASE-TRANSITIONS; SINGLE-CRYSTALS; OXYGEN-CONTENT; X-RAY; PRBACO2O5+DELTA; YBACO2O5+X; ANISOTROPY; ORDER
abstract The crystal structure and magnetic ordering in NdBaCo(2)O(5+delta) cobaltites have been studied by neutron powder diffraction. A successful refinement of the high temperature paramagnetic patterns for both as-prepared (delta similar to 0.71) and oxidized (delta similar to 0.75) compositions was performed in the Pmmm space group with a 2a(p) X 2a(p) X 2ap unit cell. The symmetry relationships between this phase and other structural types observed in oxygen-deficient LBaCo(2)O(5+delta) perovskites are discussed. The analysis of the low-temperature diffraction data on oxidized NdBaCo(2)O(5.75) requires to account for the magnetic contribution originating from both the Nd and the Co sublattices. These are ordered at T(C)similar to 180 K and T(N)similar to 40 K, respectively, with ferromagnetic coupling inside the sublattices and antiferromagnetic coupling between them. A comparison of the neutron diffraction and magnetization data leads to the conclusion that no uniform ferromagnetic ordering of the Co sublattice is developed and a moderate amount of small antiferromagnetic clusters, exists below T(C).
publisher AMER PHYSICAL SOC
issn 1098-0121
year published 2008
volume 77
issue 17
digital object identifier (doi) 10.1103/PhysRevB.77.174417
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000256763800071
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