Specific heat at the magnetic order transitions in RbFe(MoO4)2

G. A. JORGE; C. CAPAN; F. RONNING; M. JAIME; M. KENZELMANN; G. GASPAROVIC; C. BROHOLM; A. YA. SHAPIRO; L. A. DEMIANETS

Buenos Aires

Conferencia; At the frontier of Condensed Matter 2004; 2004

We measured the low temperature specific heat of antiferromagnetic RbFe(MoO4)2 single-crystal samples, by means of a microcalorimetric technique, in magnetic fields up to 15T applied along the ab plane. Peaks in the specific heat vs. temperature were observed at all the magnetic phase transitions present in this system below 4K. The temperature at which specific heat anomalies were observed are in agreement with earlier neutron scattering results. Additionally, we found that the transition into the paramagnetic state upon heating in a magnetic field of 10T or larger decreases in increasing fields, extrapolating to zero temperature at an approximate field of 19 T.