The Magnetic Hyperfine Field of 111Cd in the Rare Earth–Nickel Laves Phases RNi2

Chaves

Journal of Magnetism and Magnetic Materials

et al. 2016

We study the formation of local magnetic moments and magnetic hyperfine fields at an s-p impurity diluted in intermetallic Laves phases compounds RNi2 (R = Nd, Sm, Gd, Tb, Dy) at finite temperatures. We start with a clean host and later the impurity is introduced. The host has two-coupled (R and Ni) sublattice Hubbard Hamiltonians but the Ni sublattice can be disregarded because its d band, being full, is magnetically ineffective. Also, the effect of the 4f electrons of R is represented by a polarization of the d band that would be produced by the 4f magnetic field.This leaves us with a lattice of effective rare earth R-ions with only d electrons. For the dd electronic interaction we use the Hubbard-Stratonovich identity in a functional integral approach in the static saddle point approximation.

Section: Resultssupporting

confidence: 90%

Temperature dependence of the magnetic hyperfine field at an s–p impurity diluted in R Ni 2

Chaves

Journal of Magnetism and Magnetic Materials

et al. 2016

J. Phys.: Condens. Matter

“…The variation of B hf as a function of rare-earth element, measured with 140 Ce for these compounds at the lowest temperature is quite different from that of B hf measured with 111 Cd in rare-earth metals [42,43] and in rare-earth based binary intermetallic compounds [44,45]. It is also different from that measured with 140 Ce in rare-earth based binary [46] and ternary [47] intermetallic compounds.…”

Section: Discussioncontrasting

confidence: 59%

The effect of hybridization on local magnetic interactions at highly diluted Ce ions in tetragonal intermetallic compounds RERh₂Si₂(RE=Ce, Pr, Nd, Gd, Tb, Dy)

Cabrera-Pasca

Carbonari

Bosch-Santos

et al. 2012

The contribution of the 4f electron to the local magnetic field at highly diluted Ce atoms in RERh(2)Si(2) (RE = Ce, Pr, Nd, Gd, Tb, Dy) has been investigated as a function of temperature through the measurement of the magnetic hyperfine field in (140)Ce nuclei by time differential perturbed gamma-gamma angular correlation spectroscopy. Samples of the studied compounds were characterized by x-ray diffraction and zero-field resistance to determine the crystal structure and transport properties. DC magnetic susceptibility was measured for NdRh(2)Si(2). It was observed that the variation of the magnetic hyperfine field with temperature follows the expected behaviour for the host magnetization, with the exception of GdRh(2)Si(2), which showed a strong deviation from such a behaviour. It is shown that the hybridization of the d band of the host with the f band of the Ce impurity, which is stronger in GdRh(2)Si(2) than in other compounds, is responsible for the observed deviation from the expected temperature dependence of the hyperfine field. The origin of this stronger hybridization is ascribed to the relatively small magnetic anisotropy observed in GdRh(2)Si(2) when compared with the other compounds of the series, as shown by resistance measurements.

Journal of Applied Physics

“…One, therefore, expects B hf to be linearly proportional to spin projection of S along J, (g -1) J. 16 Results of B hf at 0 K obtained from the fit for both probe nuclei, 111 Cd and 140 Ce (host contribution), show linear dependence with (g -1) J.…”

Section: Methodsmentioning

confidence: 97%

Investigation of the magnetic hyperfine field at R and Zn sites in RZn (R = Gd, Tb, Dy) compounds using perturbed gamma-gamma angular correlation spectroscopy with 140Ce and 111Cd as probe nuclei

Bosch-Santos

Carbonari

Cabrera-Pasca

et al. 2013

The magnetic hyperfine field (Bhf) in RZn compounds (R = Gd, Tb, Dy) has been investigated by perturbed angular correlation spectroscopy using 140Ce and 111Cd as probe nuclei, respectively, at R and Zn sites, in order to study the origin of the magnetic coupling in these compounds. The results for 111Cd probe showed that the temperature dependence of Bhf roughly follows the Brillouin function for the R total angular momentum J of each compound. The temperature dependence of Bhf measured with 140Ce probes showed, however, a sharp deviation from the Brillouin curve for all compounds, which was ascribed to the contribution of the 4f-electron of Ce3+ to Bhf.