Crystal field interactions in the chiral compounds RNi3Ga9 (R = Tb, Dy, Ho and Er) studied by inelastic neutron scattering

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dc.contributor.authorGil, Len_AU
dc.contributor.authorLora-Serrano, Ren_AU
dc.contributor.authorDuque, JGSen_AU
dc.contributor.authorGarcia, DJen_AU
dc.contributor.authorCadogan, Sen_AU
dc.contributor.authorRule, KCen_AU
dc.date.accessioned2023-05-04T23:53:53Zen_AU
dc.date.available2023-05-04T23:53:53Zen_AU
dc.date.issued2020-11-11en_AU
dc.date.statistics2023-04-28en_AU
dc.description.abstractIn recent years, compounds with chiral structures have attracted much attention mainly because of noncollinear and non-coplanar spin textures, which have an important application in spintronics. In chiral compounds, the lack of inversion symmetry can give rise to an asymmetric spin interaction, the so-called Dzyaloshinskii-Moriya interaction, which contributes to the symmetric exchange interaction and anisotropy effects from the crystal field. These interactions’ coexistence can result in unusual magnetic properties and exotic magnetic structures with potential for many applications and novel phenomena. In this work, we study the magnetic properties of the chiral compounds RN i3Ga9 (R = Tb, Dy, Ho and Er), which crystalize in a trigonal ErNi3Al9-type structure with non-centrosymmetric space group R32 [1]. For this purpose, we analyzed the inelastic neutron scattering (INS) spectra in powder samples at several temperatures (T) to study the crystal electric field (CEF) excitations and ground-state. The INS experiments were performed at the SIKA beamline using the cold triple-axis spectrometer. The spectrum was analyzed at four temperatures for ErN i3Ga9 (T = 8, 20, 50 and 100K) and two temperatures for T bN i3Ga9 (T = 50 and 100K), HoN i3Ga9 (T = 30 and 100K) and DyN i3Ga9 (T = 50 and 100K). Moreover, transverse and longitudinal magnetic susceptibility was measured in single-crystalline samples to fit the CEF parameters better. We developed a code based on the magnetic susceptibility and differential cross-section for magnetic scattering at low Q (dipole approximation) to process and analyze the experimental data. The effective CEF hamiltonian for the system follows the C3 point symmetry, which results in 9 CEF parameters overall. The least-square fitting procedure uses a machine-learning algorithm based on particle swarm optimization. We report the energy levels scheme due to the crystal field and the CEF ground state’s eigenfunctions. In particular, the INS spectra for the ErNi3Ga9 compound showed peaks associated with the so-called hot transitions, which take place between excited energy levels. We only observed peaks associated with transitions between the ground-state and the first excited levels for R = Ho, Tb, and Dy. The calculated INS spectra and magnetic susceptibility were in good agreement with the experimental data. In particular, the calculated magnetic susceptibility showed that the direction of easy magnetization occurs along the c-axis for the ErNi3Ga9 compound and along the basal plane for the other compounds. It evidences the oblate and prolate nature of the rare-earth ions charge distributions. In summary, we used inelastic neutron scattering data to establish the CEF parameters for all compounds according to the C3 point symmetry. The obtained parameters describe the CEF energy levels’ configuration and the relative intensity of the peaks observed in the INS spectrum, besides the transverse and longitudinal magnetic susceptibility in the paramagnetic region.en_AU
dc.identifier.citationGil, L., Lora-Serrano, R., Duque, J. G. S., Garcia, D., Cadogan, S., & Rule, K. (2020). Crystal field interactions in the chiral compounds RNi3Ga9 (R = Tb, Dy, Ho and Er) studied by inelastic neutron scattering. Paper presented to the ANBUG-AINSE Neutron Scattering Symposium, AANSS 2020, Virtual Meeting, 11th - 13th November 2020. (pp. 75). Retrieved from: https://events01.synchrotron.org.au/event/125/attachments/725/1149/AANSS_Abstract_Booklet_Complete_-_1_Page_Reduced.pdfen_AU
dc.identifier.conferenceenddate13 November 2020en_AU
dc.identifier.conferencenameANBUG-AINSE Neutron Scattering Symposium, AANSS 2020en_AU
dc.identifier.conferenceplaceVirtual Meetingen_AU
dc.identifier.conferencestartdate11 November 2020en_AU
dc.identifier.pagination75en_AU
dc.identifier.urihttps://events01.synchrotron.org.au/event/125/contributions/3705/contribution.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14994en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineering (AINSE)en_AU
dc.subjectSpinen_AU
dc.subjectAnisotropyen_AU
dc.subjectHamiltoniansen_AU
dc.subjectMagnetizationen_AU
dc.subjectNeutronsen_AU
dc.subjectScatteringen_AU
dc.subjectGround statesen_AU
dc.subjectParticlesen_AU
dc.subjectSymmetryen_AU
dc.subjectDataen_AU
dc.titleCrystal field interactions in the chiral compounds RNi3Ga9 (R = Tb, Dy, Ho and Er) studied by inelastic neutron scatteringen_AU
dc.typeConference Abstracten_AU
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