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Observation of high-temperature magnetic transition and existence of ferromagnetic short-range correlations above transition in double perovskite LaFeMnO

RSC Advances, ISSN: 2046-2069, Vol: 5, Issue: 128, Page: 105531-105536
2015
  • 42
    Citations
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  • 49
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Metrics Details

  • Citations
    42
    • Citation Indexes
      42
  • Captures
    49

Article Description

We present the observation of a high-temperature magnetic transition along with ferromagnetic short-range correlations (FSCs) in LaFeMnO perovskite system. XPS analysis confirmed the presence of Fe and Mn cations. Magnetization vs. temperature curves show two distinct transitions at T ∼ 60 K and T ∼ 425 K. Coercivity values of ∼1140 Oe and ∼35 Oe are observed at 2 K and 300 K respectively. Thermomagnetic analysis reveals the presence of FSCs in LaFeMnO up to T∗ = 570 K, well above the transition point, similar to a Griffiths-like phase (GP). The presence of ferromagnetic clusters in the paramagnetic region might be due to the intrinsic inhomogeneities associated with the structure, the quenched disorder related to the B-site cations and the antisite boundaries. The coefficient of lower temperature electronic specific heat is as high as 59.5 mJ mol K. The electron spin resonance spectra show ferromagnetic resonance signals that point to the possibility of the presence of FSCs at room temperature. The material seems to be quite a promising candidate for some room temperature applications due to the possibility of the coexistence of functionalities like ferromagnetism, ferrimagnetism, GP, magnetotransport coupling, etc. in a single material.

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