2017/07/20 by Paromita Mukherjee, P. Mukherjee, A C Sackville Hamilton +5
Chemistry · Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #High-pressure geophysics and materials #Ion #Lanthanide #Magnetic and transport properties of perovskites and related materials #Materials science #Sensitivity (control systems) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/1361-648x/aa810e
published as J. Phys. Condens. Matter 29, 405808 (2017) · 22 pages, 7 figures, 1 supplementary figure, accepted for publication in Journal of Physics: Condensed Matter
openalex publication_date 2017/07/20 · arxiv created 2017/07/21 · openalex created_date 2017/07/31 · arxiv updated 2017/09/05 · openalex updated_date 2026/08/05
Abstract A systematic study of the structural and magnetic properties of three-dimensionally frustrated lanthanide garnets Ln 3 A 2 X 3 O 12 , Ln = Gd, Tb, Dy, Ho, A = Ga, Sc, In, Te, X = Ga, Al, Li is presented. Garnets with Ln = Gd show magnetic behaviour consistent with isotropic Gd 3+ spins; no magnetic ordering is observed for T ⩾ 0.4 K. Magnetic ordering features are seen for garnets with Ln = Tb, Dy, Ho in the temperature range 0.4 < T < 2.5 K, however the nature of the magnetic ordering varies for the different Ln as well as for different combinations of A and X . The magnetic behaviour can be explained by tuning of the magnetic interactions and changes in the single-ion anisotropy. The change in magnetic entropy is evaluated from isothermal magnetisation measurements to characterise the magnetocaloric effect in these materials. Among the Gd garnets, the maximum change in magnetic entropy per mole (15.45 J K −1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msubsup> <mml:mrow> <mml:mi mathvariant="normal">m</mml:mi> <mml:mi mathvariant="normal">o</mml:mi> <mml:mi mathvariant="normal">l</mml:mi> </mml:mrow> <mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">G</mml:mi> <mml:mi mathvariant="normal">d</mml:mi> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msubsup> </mml:mstyle> </mml:math> ) is observed for Gd 3 Sc 2 Ga 3 O 12 at 2 K, in a field of 9 T. The performance of Dy 3 Ga 5 O 12 as a magnetocaloric material surpasses the other garnets with Ln = Tb, Dy, Ho.