Magnetic Field Effect and Dielectric Anomalies at the Spin Reorientation   Phase Transition of GdFe3(BO3)4
  GdFe3(BO3)4 exhibits a structural phase transition at 156 K, antiferromagnetic order of the Fe3+ moments at 36 K followed by a spin reorientation phase transition at 9 K. The reorientation phase transition is studied through dielectric, magnetic and heat capacity measurements under the application of external magnetic fields of up to 7 kOe. The dielectric constant indicates the existence of two distinct anomalies at T_SR = 9 K that separate in temperature under external magnetic fields. The spin rotation phase transition is proven to be of the first-order nature through the magnetic analogue of the Clausius-Clapeyron equation. Magneto-dielectric effect of up to 1% is observed at 8 K and 7 kOe. The uniaxial magnetocaloric effect along the c axis is observed below the spin reorientation phase transition of 9 K. 
F. Yen (1), B. Lorenz (1), Y. Y. Sun (1), C. W. Chu (1 and 2 and 3),   L. N. Bezmaternykh (4), A. N. Vasiliev (5) ((1) TCSUH...