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Magnetic ordering in TmGa.

J M Cadogan1, G A Stewart, S Muñoz Pérez

  • 1School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, Canberra, ACT, BC 2610, Australia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 5, 2014
PubMed
Summary
This summary is machine-generated.

We studied the magnetic structure of thulium gallium (TmGa) using neutron diffraction and Mössbauer spectroscopy. TmGa exhibits complex magnetic ordering, transitioning from antiferromagnetic to predominantly ferromagnetic behavior at low temperatures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Intermetallic compounds offer unique magnetic properties.
  • Thulium gallium (TmGa) is an intermetallic compound with an orthorhombic CrB-type structure.
  • Understanding magnetic structures is crucial for developing advanced magnetic materials.

Purpose of the Study:

  • To determine the magnetic structure of TmGa.
  • To investigate the magnetic ordering transitions in TmGa.
  • To characterize the magnetic moments and fields within TmGa.

Main Methods:

  • High-resolution neutron powder diffraction.
  • (169)Tm Mössbauer spectroscopy.
  • Analysis of magnetic ordering and propagation vectors.

Main Results:

  • TmGa orders magnetically at 15(1) K with an incommensurate antiferromagnetic structure (k1 = [0 0.275(2) 0]).
  • A first-order transition at 12 K results in dominant ferromagnetic ordering along the a-axis.
  • At 3 K, TmGa is primarily ferromagnetic with a residual incommensurate component; ferromagnetic Tm moment reaches 6.7(2) μB.

Conclusions:

  • TmGa displays a complex, temperature-dependent magnetic structure.
  • The transition to ferromagnetic ordering involves significant changes in magnetic arrangement.
  • Detailed magnetic characterization provides insights into rare-earth intermetallics.