Crystal Electric Field Splitting in TbNi₅ and ErNi₅ Studied by Inelastic Neutron Scattering

Abstract

G . IVANITSKII (b), V. T. KROTENKO (b), M. V. PASECHNIK (b), V. V. SLISENKO (b), A . A. VASILKEVICH (b), B. LIPPOLD (c), 0. D. CHISTYAKOV (d), and E:. M. SAVITSKII (d)Crystal field effects in plycrystalline samples of Tbh'i, and ErNi, are studied on the basis of inelastic neutron scattering experiments. Using the crystal field parameters derived from the neutron scattering the magnetic contribution of the specific heat capacity, the components of the static susceptibility, as well as the components of the magnetization are calculated, and compared with the corresponding experimental results for single crystals. The quadrupolar contribution of the crystal electric field Bi is related to the electric field gradients measured by TDPAC.Ausgehend von Messungen der inelastischen Neutronenstreuung werden in polykristallinen Proben von TbXi, und ErNi, Kristallfeldwirkungen untersucht. Mit den aus der h'eutronenstreuung erheltenen Kristallfeldparametern werden der magnetische Anteil an der spezifischen Warmekepazitit. die Komponenten der statischen Suszeptibilitiit nnd die Komponenten der Magnetisierung berechnet und diese mit den entaprechenden experimentellen Ergebnissen fur Monokristalle verglichen. Der Quadrupolbeitrag des elektrischen Kristellfeldes B; wird mit den elektrischen Feldgradienten, die mitkls TDPAC gemessen wurden, in Beziehung gebracht.

Spin dynamics in RENi5 ferromagnets byμSR measurements

“…( 1 ) describe respectively the rela.xation induced by one and two phonon processes. This interpretation is consistent with the known energy level diagrana [15]. In Fig.…”

The magnetism of at low fields

“…In this compound, the main contribution to the magnetization comes from the 4f electrons of the terbium ions, and the contribution of the nickel to the magnetism is very small because its 3d shell is almost filled up by the 5d electrons of the terbium ion. On the basis of magnetization [2,3], inelastic neutron scattering [4], µSR [5], torque magnetometry [6], and NMR [7] measurements, the magnetic and thermodynamic properties of this compound have become well understood within a mean-field model involving exchange and crystalline-electric-field magnetoelastic and quadrupolar interactions. There is a magnetic order-disorder transition at 23 K with the magnetic moments ordered ferromagnetically in the basal plane of the hexagonal structure.…”

Determining the magnetic ground state of TbNi5 single crystal using polarized neutron scattering technique

“…A prime example of such an interplay is the magnetic ground state of TbNi 5 [5]. The TbNi 5 compound has been extensively studied by means of several experimental techniques: magnetization and susceptibility [6,7], specific heat [8], X-ray magnetic circular dichroism [9], mSR spectroscopy [10], spin-echo NMR [5], elastic and inelastic neutron scattering [11][12][13]. Results of these experiments appeared to be in good agreement with a simple model of a ferromagnetic structure, which undergoes ferro-paramagnetic phase transition at T p ¼ 23 K. It is worth while to note that most of the above mentioned experiments have been carried out either at high magnetic field at low temperature or at zero field in the paramagnetic state.…”