Giant low-field magnetocaloric effect in single-crystalline EuTi0.85Nb0.15O3

The magnetocaloric effect in ferromagnetic single crystal EuTi0.85Nb0.15O3 has been investigated using magnetization and heat capacity measurements. EuTi0.85Nb0.15O3 undergoes a continuous ferromagnetic phase transition at T-C = 9.5 K due to the long range ordering of magnetic moments of Eu2+ (4f(7)). With the application of magnetic field, the spin entropy is strongly suppressed and a giant magnetic entropy change is observed near T-C. The values of entropy change Delta S-m and adiabatic temperature change Delta T-ad are as high as 51.3 J kg(-1) K-1 and 22 K, respectively, for a field change of 0-9 T. The corresponding magnetic heating/cooling capacity is 700 J kg(-1). This compound also shows large magnetocaloric effect even at low magnetic fields. In particular, the values of Delta S-m reach 14.7 and 23.8 J kg(-1) K-1 for field changes of 0-1 T and 0-2 T, respectively. The low-field giant magnetocaloric effect, together with the absence of thermal and field hysteresis makes EuTi0.85Nb0.15O3 a very promising candidate for low temperature magnetic refrigeration. (C) 2016 Author(s).