Basal plane ferromagnetism in the rhombohedral manganite La0.85Ag0.15MnO3+δ

• Published in: Journal of magnetism and magnetic materials Vol. 498; p. 1
• Main Authors: Larsen, C.B., Samothrakitis, S., Fortes, A.D., Ayaş, A.O., Akyol, M., Ekicibil, A., Laver, M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.03.2020; Elsevier BV
• Subjects: Basal plane; Crystals; Ferromagnetism; High resolution; Lanthanum; Lanthanum compounds; Magnetic measurement; Magnetic properties; Magnetism; Magnetocaloric effect; Manganite; Manganites; Neutron diffraction; Neutron powder diffraction; Magnetocaloric effect; Manganite; Neutron powder diffraction
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.166192

•The structural and magnetic effects of silver doping on LaMnO3+δ are investigated.•Crystal structure of La0.85Ag0.15MnO3+δ is predominantly R3¯c between 4 and 300 K.•Magnetism below Tc=246 K is ferromagnetic with collinear moments in basal plane.•Silver doping improves hole-to-vacancy ratio, stabilizing ferromagnetism.•Fully collinear moments mean larger magnetization and larger magnetocaloric effect. The structural and magnetic properties of silver-doped lanthanum manganite, La0.85Ag0.15MnO3+δ,δ=0.10(2), have been studied using magnetometry and high-resolution neutron powder diffraction. The structural space group is found to be predominantly R3¯c, with a minor (5%) fraction of Pnma phase. This phase fraction does not change in the measured temperature range of 4 K to 300 K. Our high-resolution diffraction data allow a detailed analysis of the spin orientation. Using representational analysis, we find the ferromagnetic state below Tc=246 K has spins oriented perpendicular to the rhombohedral c-axis and is purely ferromagnetic i.e. no canting between sublattices is observed. Implications for the magnetocaloric effect are discussed.