Crystal field study in rare-earth-dopedLuInNi4

Abstract

Magnetic susceptibility and electron spin resonance experiments in the rare earth (RϭNd, Er, and Yb͒ 5 -25% doped cubic intermetallic LuInNi 4 enable estimates of the fourth A 4 and sixth A 6 order crystal-field parameters for this compound. These parameters yield a ⌫ 6 doublet, a ⌫ 7 doublet, and a ⌫ 8 quartet as the ground states for Nd 3ϩ , Er 3ϩ , and Yb 3ϩ , respectively, and an overall crystal-field splitting of 100-300 K. The A 4 and A 6 parameters are found to have comparable order of magnitude for all the R studied and their values are in agreement with reported values for other cubic systems.

Antiferromagnetic order inEuRh2(Ga,In)8

“…14 This suggests that the unusual shapes of these second transitions can be attributed to peculiarities in the exchange interaction in the ordered state and to the presence of small crystal field splitting. [14][15][16] To obtain the magnetic contribution to the specific heat of the Eu-compounds we scaled the specific heat of the isostructural non-magnetic YbCo 2 Ga 8 with the quotient of square root of the molecular masses and subtracted the result from the specific heat of the corresponding Eu-compound. From the magnetic contribution of C / T we calculated the magnetic entropy of EuRh 2 Ga 8 and EuRh 2 In 8 (not shown).…”

Magnetic Field Induced Orbital Polarization in CubicYbInNi4: Determining the Quartet Ground State Using X-Ray Linear Dichroism

“…Figure 1 summarizes some crystal-field scenarios which have been suggested for this system: inelastic neutron scattering studies infer a |Γ 8 quartet ground state [23], while specific heat, magnetization and ESR experiments claimed to have found a |Γ 7 doublet ground state [24,25]. Yet, one can envision even another scenario: measurements on YbInCu 4 with 50% Y doping proposed a CF scheme with a quasi-quartet ground state as shown on the right in Fig.…”

“…However, here we demonstrate that the application of a magnetic field can provide key information about the nature of the ground state wave function. We have done so using YbInNi 4 as an exemplary model system: it has the relative simplicity of a stable valent system and yet there is a long standing debate about its ground state wave function [23][24][25]. Very recently, also a new interesting scenario has been proposed for the closely related compound Yb 0.5 Y 0.5 InCu 4 [26].…”