Multiple caloric effects in geometrically frustrated "114" CaBaCo4O7 Cobaltite

We have investigated the magnetocaloric and electrocaloric effects in "114" CaBaCo4O7 (CBCO) sample prepared by solid state method. Magnetization study has revealed the ferrimagnetic transition (T-C) at 60 K and another transition at 66 K. Observation of irreversibility and first order nature of magnetic transition above T-C has suggested a complicated magnetic nature of the system. A maximum magnetic entropy change of similar to 6.8 J/Kg-K has been found at T-C and further a broadening of the entropy peak with the increase of magnetic field indicates the field induced transition above T-C. From temperature dependent pyrocurrent measurements, we have measured the electric polarization under different electric fields and the change in isothermal electrocaloric entropy is found to be similar to 0.501-m(-3) K-1 (for 150 kV/m) just above magnetic transition temperature. (C) 2016 Elsevier B.V. All rights reserved.