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Antiferromagnetic ordering in MnF(salen).

Erik Čižmár1, Olivia N Risset, Tong Wang

  • 1Department of Condensed Matter Physics, P. J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 11, 2016
PubMed
Summary
This summary is machine-generated.

Antiferromagnetic order was found in the manganese(III) fluoride salen system (S=2 linear chains) at 3.1 K. Specific heat and NMR studies confirmed this transition, showing a field-independent cusp and changes in spin-lattice relaxation time.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Investigating magnetic ordering in low-dimensional systems is crucial for understanding fundamental magnetic interactions.
  • Manganese(III) fluoride salen complexes represent a class of materials with potential for novel magnetic properties due to their S=2 spin centers and linear chain structure.

Purpose of the Study:

  • To identify and characterize the magnetic ordering transition in Mn(III)F(salen).
  • To elucidate the nature of the magnetic transition using complementary experimental techniques.

Main Methods:

  • Single-crystal X-ray diffraction to confirm structural properties.
  • Specific heat measurements in applied magnetic fields up to 9 Tesla.
  • Pulsed Nuclear Magnetic Resonance (NMR) spectroscopy, including spin-lattice relaxation time (T1) and linewidth analysis at 42 MHz.
  • Low-field magnetic susceptibility measurements on single crystals and microcrystalline samples.

Main Results:

  • Antiferromagnetic order was definitively identified in Mn(III)F(salen) at 3.1 K.
  • Specific heat data revealed a sharp, field-independent cusp at the ordering temperature.
  • Proton NMR studies showed significant changes in T1 and linewidths at 3.1 K, corroborating the magnetic transition.
  • Low-field magnetic susceptibility measurements exhibited subtle features associated with the transition.

Conclusions:

  • Mn(III)F(salen) exhibits bulk antiferromagnetic ordering as a linear-chain S=2 system.
  • The observed field-independent specific heat anomaly and NMR signatures confirm the transition temperature and its bulk nature.
  • The study provides a comprehensive characterization of the magnetic ordering in this specific manganese complex.