The effect of pressure on La${}_{1.5}$Ca${}_{0.5}$CoIrO${}_6$ re-entrant spin-glass

Abstract

La${}_{1.5}$Ca${}_{0.5}$CoIrO${}_6$ is a re-entrant spin-glass (SG) that exhibits antiferromagnetic and ferromagnetic couplings at $T\sim 95$ and $\sim 86$ K, respectively, and at $T\sim 25$ K a SG phase emerges. In this work we investigated the effect of hydrostatic pressure ($P$) on La${}_{1.5}$Ca${}_{0.5}$CoIrO${}_6$ magnetic properties. By means of magnetization as a function of temperature measurements, carried under different applied pressures and/or magnetic fields, we have found that the freezing temperature of the SG phase exhibits an initial increase followed by a decrease with increasing $P$, and that the maximum $P$ = 7.9 kbar was not sufficient to prevent the formation of the frozen state. Since the ordering temperatures of the antiferromagnetic and ferromagnetic phases are also affected by $P$, we discuss the results here found in terms of changes on the balance between the magnetic phases.

4 pages, 4 figures