Specific heat measurements in scandium-rare earth anisotropic spin glasses

PUREUR, P.; FRAGA, G.L.; BRANDÃO, D.E.; CAUDRON, R.; SAFA, H.; NIEVA, G.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ELSEVIER SCIENCE BV

Año: 1987 vol. 68 p. 213 - 217

0304-8853

We report on specific heat measurements at low temperature of the anisotropic spin glass alloys ScDy 3 at%, ScEr 4.25 at% and ScEr 10 at%. We find that at the lowest temperature range the data indicate the occurrence of an anisotropy induced gap around zero frequency in the density of states of the magnetic excitations. Moreover, some of our specific heat curves present a maximum coinciding with Tg, raising thus the question of thermal signs for a spin glass phase transition in anisotropic systems. © 1987.