Magnetoelastic coupling and spin reorientation in RECo5 uniaxial magnets (RE = Pr,Dy, Ho and Y). II |
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| Institution: | 1. Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, School of Environment, Henan Normal University, XinXiang 453007, PR China;2. School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, PR China;3. School of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang 453003, PR China;1. Department of Mathematical Sciences, College of Natural Sciences, Redeemer’s University, Nigeria;2. Department of Physical Sciences, College of Natural Sciences, Redeemer’s University, Nigeria;3. Faculty of Military Science, Stellenbosch University, Private Bag X2, Saldanha 7395, South Africa;1. Department of Chemistry, Faculty of Mathematical and Physical Sciences, Ramaiah University of Applied Sciences, Bangalore 560058, India;2. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Pune 411008, India;1. Department of Theoretical Physics and Astrophysics, Faculty of Science, P. J. Šafárik University, Park Angelinum 9, 040 01 Košice, Slovakia;2. Departamento de Física, Universidade Federal de Lavras, CP 3037, 37200-000, Lavras-MG, Brazil;1. Instituto de Física de Materiales Tandil (IFIMAT), Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Pinto 399, 7000 Tandil, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina |
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| Abstract: | Magnetostriction measurements, between ≈ 5 and 300 K, of powder aligned samples of the uniaxial compounds RECo5 (RE = Pr, Ho, Dy and Y) for strong applied magnetic fields up to 15 T are reported. The strains have been measured, parallel, perpendicular and at 45° form the c-axis, with the field applied also along these directions. These sets of measurements allow us to determine the six irreducible magnetoelastic coupling constants: λα11, λα21, related to the strain dependence of isotrop ic exchange, and λα12, λα22, λγ and λϵ, describing the strain dependence of the magnetocrystalline anisotropy ene rgy. Anomalies on the strains, associated with the spin reorientation (SR) regime are observed. The thermal variation of the strains is well explained by the standard magnetostriction model, including as ingredients exchange striction and the single-ion anisotropic one, as well as a dependence on the angle of reorientation under field. The point charge model of the crystalline magnetoelastic field is far from agreement with the present results. |
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