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Title: Glassy magnetic phase driven by short range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO3-δ: Magnetization, Mössbauer, and polarized neutron studies
Author: Sabyasachi, Sk.
Patra, M.
Majumdar, S.
Giri, S.
Das, S.
Amaral, V. S.
Iglesias, Òscar
Borghols, W.
Chatterji, T.
Keywords: Difracció de neutrons
Física de l'estat sòlid
Dispositius de memòria d'ordinador
Matèria condensada
Neutron diffraction
Solid state physics
Computer storage devices
Condensed matter
Issue Date: 12-Sep-2012
Publisher: American Physical Society
Abstract: The charge ordered La1/3Sr2/3FeO3−δ (LSFO) in bulk and nanocrystalline forms are investigated using ac and dc magnetization, M¨ossbauer, and polarized neutron studies. A complex scenario of short-range charge and magnetic ordering is realized from the polarized neutron studies in nanocrystalline specimen. This short-range ordering does not involve any change in spin state and modification in the charge disproportion between Fe3+ and Fe5+ compared to bulk counterpart as evident in the M¨ossbauer results. The refinement of magnetic diffraction peaks provides magnetic moments of Fe3+ and Fe5+ are about 3.15 μB and 1.57 μB for bulk, and 2.7 μB and 0.53 μB for nanocrystalline specimen, respectively. The destabilization of charge ordering leads to magnetic phase separation, giving rise to the robust exchange bias (EB) effect. Strikingly, EB field at 5 K attains a value as high as 4.4 kOe for average size ∼70 nm, which is zero for the bulk counterpart. A strong frequency dependence of ac susceptibility reveals cluster-glass-like transition around ∼65 K, below which EB appears. Overall results propose that finite-size effect directs the complex glassy magnetic behavior driven by unconventional short-range charge and magnetic ordering, and magnetic phase separation appears in nanocrystalline LSFO.
Note: Reproducció del document publicat a:
It is part of: Physical Review B, 2012, vol. 86, p. 104416-1-104416-9
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ISSN: 1098-0121
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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