The effect of pressure on La1:5Ca0:5CoIrO6 re-entrant spin-glass

Abstract

La1:5Ca0:5CoIrO6 is a re-entrant spin-glass (SG) that exhibits antiferromagnetic and ferromagnetic couplings at T 95 and 86 K, respectively, and at T 25 K a SG phase emerges. In this work we investigated the effect of hydrostatic pressure (P) on La1:5Ca0:5CoIrO6 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.