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Evidence of ferromagnetic short-range correlations in cubic LaSrMnO(x=0.80, 0.85) above antiferromagnetic ordering

Physica Status Solidi (B) Basic Research, ISSN: 1521-3951, Vol: 252, Issue: 8, Page: 1832-1838
2015
  • 15
    Citations
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  • 16
    Captures
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Metrics Details

  • Citations
    15
    • Citation Indexes
      15
  • Captures
    16

Article Description

We report the existence of ferromagnetic correlations (FMC) in the paramagnetic (PM) matrix of cubic LaSrMnO(x=0.80, 0.85) well above its coupled structural, magnetic, and electronic phase transitions. The dc-magnetization versus temperature [M(T)] behavior under different magnetic fields (from 100Oe to 70kOe) shows the presence of short-range magnetic correlations up to (T∼)365K, far above the antiferromagnetic ordering temperatures (T=)260 and 238K for x=0.80 and 0.85, respectively. More importantly the observed short-range FMC survive even up to 70kOe, which indicates their robust nature. The temperature region between Tand Tis dominated by the presence of correlated ferromagnetic (FM) entities within the PM matrix and stabilized due to A-site chemical disorder. Our results further illustrate that for the studied compositions, the oxygen off-stoichiometry does not have any significant effect on the nature and strength of these FM entities; however, FM interactions increase in the oxygen-deficient samples. These compositions are the unique examples, where the presence of FMC is observed in an undistorted basic cubic perovskite lattice well above Tand therefore are novel to understand the physics behind the colossal magnetoresistance effect.

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