2017/10/13 by P. Mukherjee, Paromita Mukherjee, H. F. J. Glass +5
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Frustration #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Multiferroics and related materials #Neutron diffraction #Physics #Spins #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.140412
published as Phys. Rev. B 96, 140412 (2017) · 19 pages, 3 figures, 4 supplementary figures, accepted for publication in Physical Review B as a Rapid Communication
arxiv created 2017/10/13 · openalex publication_date 2017/10/25 · arxiv updated 2017/10/27 · openalex created_date 2017/11/10 · openalex updated_date 2026/08/05
We present a Rapid Communication 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\phantom\rule0.16em0exK for Ho3MnGa4O12 is raised by a factor of almost 20 when compared to Ho3Ga5O12. Powder neutron diffraction on Ho3MnxGa_5\ensuremath-xO12 (x=0.5,1) below TN shows the formation of a long-range-ordered state with k=(0,0,0). Ho3+ spins are aligned antiferromagnetically along the six crystallographic axes with no resultant moment, whereas the Mn3+ spins are oriented along the body diagonals such that there is a net moment along [111]. The magnetic structure can be visualized 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=\ensuremathθCW/TN\ensuremath∼1.1 for Ho3MnGa4O12.