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Magnetic glass state and magnetoresistance in SrLaFeCoO6 double perovskite
, R. Pradheesh, G. R. Haripriya,
Published in Institute of Physics Publishing
2017
PMID: 28106011
Volume: 29
   
Issue: 9
Abstract
Unusual features in magnetization resembling the kinetic arrest of a magnetic glass state are observed in the La-doped double perovskite, SrLaFeCoO6. Neutron powder diffraction experiments confirm the presence of antisite disorder as well as a lack of long-range magnetic order down to 4 K in this double perovskite which displays spin glass-like features in dc and ac susceptibilities. Magnetic relaxation observed through cooling and heating under unequal fields (CHUF) point towards unusual domain dynamics which is supported by a broad memory effect. Among the two anomalies that are observed at 75 K and at 250 K in the magnetic measurements, the former is associated with a spin-freezing temperature below which the magnetic glass state is experimentally verified. The magnetometric experiments detailed in the paper bring out the non-equilibrium metastable magnetic states in this disordered magnetic system. The magnetic glass state described above manifests in the electrical resistivity through the formation of a 'hard gap' because of the spin-exchange energy following the formation of magnetic glass. It is observed that the combination of disorder and magnetic glass state leads to a large, negative magnetoresistance (MR) of ≈47 at 5 K in 8 T. © 2017 IOP Publishing Ltd.
About the journal
JournalJournal of Physics Condensed Matter
PublisherInstitute of Physics Publishing
ISSN09538984
Open AccessNo
Concepts (17)
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    Cobalt compounds
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    Glass
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    Iron compounds
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    Lanthanum compounds
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    Magnetic susceptibility
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    Magnetoresistance
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    Perovskite
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    Strontium compounds
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    Ac susceptibility
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    Antisite disorder
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    Double perovskites
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    LONG RANGE MAGNETIC ORDER
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    MAGNETIC GLASS
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    METASTABLE MAGNETIC STATE
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    Negative magneto-resistance
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    Spin-freezing temperature
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    Spin glass