Influence of the magnetic sublattices in the double perovskite LaCaNiReO6

Abstract

The magnetism of double perovskites is a complex phenomenon, determined from intra- or interatomic magnetic moment interactions, and strongly influenced by geometry. We take advantage of the complementary length and timescales of the muon spin rotation, relaxation, and resonance (${\ensuremath{\mu}}^{+}\mathrm{SR}$) microscopic technique and bulk ac/dc magnetic susceptibility measurements to study the magnetic phases of the ${\mathrm{LaCaNiReO}}_{6}$ double perovskite. As a result, we are able to discern and report ferrimagnetic ordering below ${T}_{\mathrm{C}}=102\phantom{\rule{4pt}{0ex}}\mathrm{K}$ and the formation of different magnetic domains above ${T}_{\mathrm{C}}$. Between ${T}_{\mathrm{C}}<T<270\phantom{\rule{4pt}{0ex}}\mathrm{K}$, the following two magnetic environments appear, a dense spin region and a static-dilute spin region. The paramagnetic state is obtained only above $T>270\phantom{\rule{4pt}{0ex}}\mathrm{K}$. An evolution of the interaction between Ni and Re magnetic sublattices, in this geometrically frustrated fcc perovskite structure, is revealed as a function of temperature through the critical behavior and thermal evolution of microscopic and macroscopic physical quantities.