Repeated magnetic compensation behavior in the rare-earth alloyNd0.75Gd0.25Rh3B2

Abstract

The results of dc and ac magnetization, electrical resistance and heat capacity studies in an

Search and identification of repeated magnetic compensation in Nd(1-x)R(x)Al(2) (R = Gd, Tb) series

“…Interestingly, in Nd 0.8 Tb 0.2 Al 2 , we have witnessed crossing of the M = 0 axis in a multiple manner in the low field thermomagnetic response. These studies fortify the main conclusion of our earlier explorations 11 in the Nd 1−x Gd x Rh 3 B 2 . However, the magnetic compensation at higher temperature in the latter series was thought to be linked to the possible quasi-onedimensional 12 fluctuation effects along the c-axis of hexagonal CoCo 3 B 2 structure, which cannot be the situation in the cubic C15 structure for RAl 2 compounds.…”

“…4(b) also seem to feebly register the lower temperature transtion near 34 K, in addition to fingerprinting the sharp drop in spin-disorder resistivitiy at T c (≈ 86 K). It is fruitful to recall here that the two transitions in χ'(T ) and R(T ) also stand reported 11 in the admixed Nd 0.75 Gd 0.25 Rh 3 B 2 system, in which the repeated magnetic compensation behavior was recognized, perhaps, for the first time. There are, however, subtle differences in the χ'(T ) and R(T ) responses in Nd 0.8 Tb 0.2 Al 2 and Nd 0.75 Gd 0.25 Rh 3 B 2 ; in the latter system, the fingerprints of change at the higher temperature (i.e., near T c ) were very feeble, and a motivated search had to be made for them.…”

“…Recently, Kulkarni et al 11 investigated Nd 1−x Gd x Rh 3 B 2 series of alloys, which have CeCo 3 B 2 -type hexagonal structure. The magnetic moments in NdRh 3 B 2 (T c ∼ 15 K) and GdRh 3 B 2 (T c ∼ 90 K) are known to be ∼ 2.5 µ B /f.u.…”

“…In the admixed series, the ferromagnetic coupling between the spins of Nd 3+ and Gd 3+ ions caused their magnetic moments to align antiferromagnetically. It was observed that while the magnetic compensation got easily achieved for 0.20 ≤ x ≤ 0.25, a novel repeated/multiple magnetic compensation attribute was discovered in the thermomagnetic response for x = 0.25 11 . In order to explore the possible occurence of such an interesting magnetic behaviour in R 1−x R ′…”

Magnetoelectric behavior of ferrimagnetic BixCo2−xMnO4 (x=0, 0.1 and 0.3) thin films

“…However this crossover is not visible in field cooled (FC) magnetization, as both the moments reorient towards the applied field. This kind of crossover of magnetization is already reported by Kulkarni et al [24] for Nd 0.75 Gd 0.25 Rh 3 B 2 alloy at nominal zero fields. Thus, the observed crossover of ZFC magnetization for negative values can be correlated with the imbalance in the contributions from spin moments of Co ions and Mn ions, which are aligned antiparallel.…”