Effects of high pressure on the magnetic properties of Eu1-xCaxB6 (x=0.3, 0.35, and 0.4)

Abstract

We present our study of Ca substituted hexaborides, Eu1-xCaxB6 (x = 0.3, 0.35, and 0.4), through temperature-dependent magnetization M(T) and isothermal magnetization M(H) measurements under high pressures (0 <= p <= 10 kbar) and magnetic fields (0 <= H <= 7T). T-C of x = 0.3 increases with increasing pressure and the ferromagnetic interaction is observed to be increased in M(H). The antiferromagnetic transition behavior seen in x = 0.4 at ambient pressure is gradually weakened with increasing pressure and completely subdued at p = 10 kbar. From these results, we found that the physical properties of Eu1-xCaxB6 are dominated by the effective magnetic interaction between Eu moments. (c) 2006 Elsevier B.V. All rights reserved.