2017/10/06 by Haripriya G. R., G R Haripriya, Harikrishnan S. Nair +16
Materials Science · Physics and Astronomy · #Advancements in Solid Oxide Fuel Cells #Magnetic and transport properties of perovskites and related materials #Magnetic anisotropy #Magnetic domain #Magnetic structure #Magnetism #Magnetization #Multiferroics and related materials #Paramagnetism #Phase transition #Spin (aerodynamics) #Spin polarization #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/1361-648x/aa919e
published as Journal of Physics: Condensed Matter. 2017 Nov 6;29(47):475804
openalex publication_date 2017/10/06 · openalex created_date 2017/10/20 · arxiv created 2017/12/01 · arxiv updated 2017/12/04 · openalex updated_date 2026/08/05
Abstract We report the experimental observation of spin reorientation in the double perovskite Ho 2 FeCoO 6 . The magnetic phase transitions in this compound are characterized and studied through magnetization and specific heat, and the magnetic structures are elucidated through neutron powder diffraction. Two magnetic phase transitions are observed in this compound-one at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi mathvariant="normal">N</mml:mi> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> <mml:mo>≈</mml:mo> <mml:mn>250</mml:mn> </mml:mstyle> </mml:math> K, from paramagnetic to antiferromagnetic, and the other at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mi mathvariant="normal">N</mml:mi> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:mo>≈</mml:mo> <mml:mn>45</mml:mn> </mml:mstyle> </mml:math> K, from a phase with mixed magnetic structures to a single phase through a spin reorientation process. The magnetic structure in the temperature range 200–45 K is a mixed phase of the irreducible representations <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msub> <mml:mi mathvariant="normal">Γ</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:mstyle> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msub> <mml:mi mathvariant="normal">Γ</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mstyle> </mml:math> , both of which are antiferromagnetic. The phase with mixed magnetic structures that exists in Ho 2 FeCoO 6 gives rise to a large thermal hysteresis in magnetization that extends from 200 K down to the spin reorientation temperature. At T N2 , the magnetic structure transforms to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mstyle displaystyle="false"> <mml:msub> <mml:mi mathvariant="normal">Γ</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:mstyle> </mml:math> . Though long-range magnetic order is established in the transition metal lattice, it is seen that only short-range magnetic order prevails in the Ho 3+ lattice. Our results should motivate further detailed studies on single crystals in order to explore the spin reorientation process, spin switching and the possibility of anisotropic magnetic interactions giving rise to electric polarization in Ho 2 FeCoO 6 .