ZhETF, Vol. 129,
p. 299 (February 2006)
(English translation - JETP,
Vol. 102, No. 2,
available online at www.springer.com
SPECIFIC HEAT OF YFe3(BO3)4, Y0.5Gd0.5Fe3(BO3)4, AND GdFe3(BO3)4
Vasiliev A.N., Popova E.A., Bezmaternyckh L.N., Temerov V.L., Hiroi Z.
Received: July 14, 2005
The specific heat was measured in the range 0.4-300 K in YFe3(BO3)4, Y0.5Gd0.5Fe3(BO3)4, and GdFe3(BO3)4 single crystals. Sharp anomalies were found at temperatures of first-order structural, second-order antiferromagnetic, and first-order spin-reorientational transitions. The Neel temperature of about 37 K was found to be virtually independent of presence of rare-earth ions, indicating rather weak coupling of Gd and Fe subsystems. The contribution of the magnetic system to specific heat was separated through the scaling procedure allowing determination of the magnetic entropy of Fe and Gd subsystems. At the lowest temperatures, the specific heat in GdFe3(BO3)4 exhibits a Schottky-type anomaly, which is due to Gd3+ eight-fold degenerate ground level splitting by the internal magnetic field of the Fe subsystem of about 7 T.