We report structural, magnetic, and Raman studies of the disordered double perovskite GdSrCoMnO6~(GSCM). DC magnetization shows a ferromagnetic transition at TC≈153~K. The inverse susceptibility exhibits a downturn above TC and is consistent with a Griffiths-like regime extending up to TG≈172~K. Raman measurements show a deviation of the phonon frequency from the anharmonic background near the magnetic-ordering region, consistent with spin-phonon coupling. AC susceptibility indicates slow magnetic dynamics below the freezing temperature Tf≈30~K. These results point to magnetic inhomogeneity generated by the random distribution of mixed-valence Co and Mn ions and by the resulting competition between ferromagnetic and antiferromagnetic interactions. In the low-temperature regime, an exchange-bias effect is observed up to 50~K, with an exchange-bias magnitude ∣HEB∣=379~Oe at 5~K. Structural disorder therefore plays an important role in the magnetic correlations, spin dynamics, and spin-lattice response of GSCM.
@article{arxiv.2604.19894,
title = {Griffiths-like phase, spin-phonon coupling, and exchange-bias in the disordered double perovskite GdSrCoMnO$_{6}$},
author = {Gyanti Prakash Moharana and Diptikanta Swain and Hanuma Kumar Dara and Debendra Prasad Panda and S. N Sarangi},
journal= {arXiv preprint arXiv:2604.19894},
year = {2026}
}