4 years ago

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln3CrGa4O12 (Ln = Tb, Dy, Ho)

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln3CrGa4O12 (Ln = Tb, Dy, Ho)
Siân E. Dutton, Paromita Mukherjee
A detailed study on the crystal structure and bulk magnetic properties of Cr substituted Ising type lanthanide gallium garnets Ln3CrGa4O12 (Ln = Tb, Dy, Ho) is carried out using room temperature powder X-ray and neutron diffraction, magnetic susceptibility, isothermal magnetization, and heat capacity measurements. The magnetocaloric effect (MCE) in Ln3CrGa4O12 is compared to that of Ln3Ga5O12. In lower magnetic fields attainable by a permanent magnet (≤ 2 T), Cr substitution greatly enhances the MCE - by 20% for Ln = Dy and 120% for Ln = Ho compared to the unsubstituted Ln3Ga5O12. This is likely due to changes in the magnetic ground state as Cr substitution also significantly reduces the frustration in the magnetic lattice for the Ising type Ln3Ga5O12. The impact of Cr substitution on the magnetocaloric effect in Ising type lanthanide gallium garnets is discussed. A 20% increase for Ln = Dy and a 120% increase for Ln = Ho is observed in a field of 2 T. Cr substitution in the frustrated garnet lattice significantly reduces the magnetic frustration.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201701950

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