Magnetostructural behavior in the non-centrosymmetric compound Nd7Pd3. (12th April 2019)

• Record Type: Journal Article
• Authors: Mudryk, Y; Ritter, C; Paudyal, D; Provino, A; Dhar, S K; Manfrinetti, P; Fauth, F; Pecharsky, V K
• Is Part Of: Journal of physics. Volume 31:Number 26(2019)
• Publication Date: 2019-04-12
• Subjects: magnetic structure -- Nd7Pd3 -- multiple magnetic transitions -- magnetoelastic ferromagnetic transition -- structural change; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab1192
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: A systematic study of the physical properties and microscopic magnetism of Nd7 Pd3 compound, which in the paramagnetic state crystallizes in the non-centrosymmetric hexagonal Th7 Fe3 -type structure ( hP 20– P 63 mc ; with a = 10.1367(1) Å and c = 6.3847(1) Å at 300 K), confirms multiple magnetic ordering transitions that occur upon cooling. Antiferromagnetic transition is observed at T N = 37 K, which is followed by ferromagnetic transformation at T C = 33 K. The first-order magnetic transition at T C is magnetoelastic: it involves a change of crystal symmetry from P 63 mc to Cmc 21 and leads to anisotropic changes of the unit cell parameters. While the antiferromagnetic structure is symmetry allowed in P 63 mc, the ferromagnetic structure with magnetic moments along the a -direction of the original hexagonal unit cell induces the first order transition to Cmc 21 . Density functional theory calculations confirm the experimentally observed ground state with the a -axis as the easy magnetization direction.