Impact of doping on the magnetic properties of holmium gallium garnet
Lanthanide garnets Ln3A2X3O12 (usually Ln = Gd, Tb, Dy, Ho and A,X= Ga, Al, Fe) show a high degree of geometrical frustration and have been studied as potential magnetocalorics for cooling below 20 K. However the impact of chemical doping on the magnetic properties and magnetocaloric effect has not been investigated in much detail. The proposed experiment focuses on Ln = Ho as Ho is suitable for powder neutron diffraction and we can synthesise powder samples of Ho garnets with a wide range of dopants-non-magnetic (Sc) and magnetic (Cr, Mn)on the A/X sites. The exact distribution of the dopant ion (Cr or Mn) cannot be determined from powder X-Ray diffraction but this is important for understanding the impact of doping on the magnetic properties.Room temperature neutron diffraction experiments on D2B would give this information. Magnetic measurements reveal ordering transitions for Ho3Sc2Al3O12 at T = 4.5 K and for Ho3MnGa4O12 at T = 5 K. We propose to study the nature of these transitions and solve the magnetic structure using powder neutron diffraction on D20 or D1B. The magnetic structure will also be compared with the parent compound, Ho3Ga5O12 to analyse the impact of dopin
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MUKHERJEE Paromita; S E Dutton; Hugh FJ Glass and SUARD Emmanuelle. (2016). Impact of doping on the magnetic properties of holmium gallium garnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2457
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