Double perovskite compounds with general formula ABB'O ₆ , have attracted lot of attention recently due to a variety of properties exhibited by them. In this talk, we will report our recent study on a series of double-perovskite compounds, exhibiting rare ferromagnetic insulating state in La ₂ NiMnO ₆ [1], hybridization driven antiferromagnetic metallic state in La-doped Sr ₂ FeMoO ₆ [2], magneto-capacitive properties [3], large magneto-optic Kerr signals [4], as well as magnetism in 3d-5d double perovskites[5].

[1] Hena Das, Umesh V. Waghmare, T. Saha-Dasgupta, D. D. Sarma, Phys. Rev. Lett. 100 , 186402 (2008).

[2] Prabuddha Sanyal, Hena Das, T. Saha-Dasgupta, Phys. Rev. B 80 , 224412 (2009); S. Jana et al., Phys. Rev. B 86 , 054433 (2012).

[3] Hena Das, Umesh V. Waghmare, T. Saha-Dasgupta, D. D. Sarma, Phys. Rev. B 79 , 144403 (2009).

[4] Hena Das, Molly De-Raychaudhury, T. Saha-Dasgupta, Appl. Phys. Lett. 92 , 201912 (2008).

[5] Hena Das, Prabuddha Sanyal, T. Saha-Dasgupta, D.D. Sarma, Phys. Rev. B 83 , 104418 (2011).