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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Published on: November 11, 2013

Memory effect in Dy0.5Sr0.5MnO3 single crystals.

S Harikrishnan1, S Rössler, C M N Kumar

  • 1Department of Physics, Indian Institute of Science, Bangalore, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 16, 2011
PubMed
Summary
This summary is machine-generated.

This study reveals memory and chaos effects in Dy(0.5)Sr(0.5)MnO(3), indicating complex magnetic relaxation in a clustered magnetic state. These findings highlight unique glassy magnetic properties deviating from typical spin glasses.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Perovskite manganites exhibit complex magnetic behaviors.
  • Understanding magnetic relaxation mechanisms is crucial for materials science.

Purpose of the Study:

  • Investigate magnetic aging effects in Dy(0.5)Sr(0.5)MnO(3).
  • Characterize the spin-glass-like state and its underlying dynamics.
  • Explore deviations from canonical spin glass behavior.

Main Methods:

  • Magnetic aging experiments on single crystals of Dy(0.5)Sr(0.5)MnO(3).
  • Analysis of memory and chaos-like effects.
  • Dynamical scaling near the spin glass freezing temperature.
  • Measurement of magnetic viscosity from zero-field-cooled magnetization.

Main Results:

  • Observed striking memory and chaos-like effects.
  • Identified strong magnetic relaxation in a clustered magnetic state.
  • Spin-glass-like state below T(sg)≈ 34 K due to quenched disorder.
  • Deviations from canonical spin glass behavior, suggesting cooperative and frustrated dynamics.
  • Microscopic spin flip times significantly longer than in atomic spin glasses.
  • Magnetic viscosity shows a peak and dependence on waiting time.

Conclusions:

  • Dy(0.5)Sr(0.5)MnO(3) exhibits unique glassy magnetic properties attributed to a heterogeneous or clustered magnetic state.
  • The observed phenomena suggest cooperative and frustrated dynamics are key.
  • The long spin flip times and magnetic viscosity behavior provide insights into the complex relaxation mechanisms.