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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Temperature dependent89Y NMR study on multiferroic YCrO3.

Ashish Kumar Mall1, A K Pramanik1

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Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 19, 2021
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Summary

This study uses 89Y Nuclear Magnetic Resonance (NMR) to investigate magnetic transitions in Yttrium Chromium Oxide (YCrO3). The research reveals insights into antiferromagnetic spin fluctuations and relaxation dynamics near the Neel temperature.

Keywords:
magnetic ordernuclear magnetic resonancerelaxation

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Magnetism

Background:

  • Yttrium Chromium Oxide (YCrO3) is a material exhibiting complex magnetic properties.
  • Understanding magnetic transitions at a microscopic level is crucial for materials science applications.

Purpose of the Study:

  • To investigate the magnetic transition in YCrO3 using 89Y Nuclear Magnetic Resonance (NMR).
  • To study magnetism and relaxation times across the paramagnetic to antiferromagnetic transition.

Main Methods:

  • Temperature-dependent 89Y NMR measurements were performed on polycrystalline YCrO3.
  • Analysis included NMR peak width, shift, intensity, and spin-lattice relaxation rates (1/T1).

Main Results:

  • A magnetic transition (T_N ≈ 141 K) was identified, marked by changes in NMR parameters.
  • Broadening of NMR peaks indicates internal magnetic fields, while spin-lattice relaxation rates reveal magnetic phase transition and low-energy spin fluctuations.
  • Knight shift and 1/TT1 correlate linearly with bulk susceptibility, suggesting antiferromagnetic spin fluctuations.

Conclusions:

  • The study confirms the magnetic origin of the phase transition in YCrO3 due to Cr3+ ions.
  • NMR measurements provide microscopic insights into antiferromagnetic spin fluctuations and relaxation dynamics in YCrO3.