Abstract
The effect of In or Ge substitution for Ga on magnetic ordering in TmGa(In/Ge) compounds was systematically investigated, where three samples of TmGa, TmGa0.9In0.1 and TmGa0.9Ge0.1 were successfully synthesized. For TmGa, two transitions from ferromagnetic (FM) to antiferromagnetic (AFM) phase at TFA = 12.6 K and from AFM to paramagnetic (PM) phase at TN = 15.6 K were clearly identified. For TmGa0.9In0.1, it shows similar magnetic transitions with TFA = 10.6 K and TN = 14.2 K. For TmGa0.9Ge0.1, Ge substitution plays an effective role on the magnetic ordering, where only one transition from AFM-to-PM occurs and the transition from FM-to-AFM disappears. Variable temperature XRD experiments confirm that the bond length between the nearest neighboring Tm atoms undergoes a sharp change around TFA with increasing temperature. The magnetic ordering and transition in TmGa(In/Ge) compounds can be well explained by lattice distortion based on Ruderman–Kittel–Kasuya–Yosida (RKKY) indirect exchange interactions. Furthermore, In or Ge substitution has a great influence on the magnetocaloric effect as well.
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