Relieving the frustration through Mn3+ substitution in Holmium Gallium Garnet
Physical Review B - Condensed Matter and Materials Physics
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Mukherjee, P., Glass, H., Suard, E., & Dutton, S. (2017). Relieving the frustration through Mn3+ substitution in Holmium Gallium Garnet. Physical Review B - Condensed Matter and Materials Physics https://doi.org/10.1103/PhysRevB.96.140412
We present a study on the impact of Mn3+ substitution in the geometrically frustrated Ising garnet Ho3Ga5O12 using bulk magnetic measurements and low temperature powder neutron diffraction. We find that the transition temperature, TN = 5.8 K, for Ho3MnGa4O12 is raised by almost 20 when compared to Ho3Ga5O12. Powder neutron diffraction on Ho3MnxGa5-xO12 (x = 0.5, 1) below TN shows the formation of a long range ordered ordered state with k = (0,0,0). Ho3+ spins are aligned antiferromagnetically along the six crystallographic axes with no resultant moment while the Mn3+ spins are oriented along the body diagonals, such that there is a net moment along . The magnetic structure can be visualised as ten-membered rings of corner-sharing triangles of Ho3+ spins with the Mn3+ spins ferromagnetically coupled to each individual Ho3+ spin in the triangle. Substitution of Mn3+ completely relieves the magnetic frustration with f = CW/TN ~ 1.1 for Ho3MnGa4O12.
Is supplemented by: https://doi.org/10.17863/CAM.13758
We acknowledge funding support from the Winton Programme for the Physics of Sustainability. Magnetic measurements were carried out using the Advanced Materials Characterisation Suite, funded by EPSRC Strategic Equipment Grant EP1M00052411.
External DOI: https://doi.org/10.1103/PhysRevB.96.140412
This record's URL: https://www.repository.cam.ac.uk/handle/1810/275128