Magnetic and transport properties of perovskites and related materials
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Abstract
Abstract
The coexistence of a Griffiths phase and superparamagnetic-like short range interaction in a single-phase homogeneous manganite is of particular interest because it reveals multiple levels of magnetic clustering generated by disorder and competing exchange interactions. In bulk La 0.19 Ca 0.81 MnO 3 , this unusual magnetic state develops in the antiferromagnetic regime, where A-site disorder strongly modifies the local magnetic landscape. Rietveld analysis confirms a single-phase orthorhombic structure, while magnetic measurements establish a Griffiths phase below T G = 280 K through the deviation from Curie–Weiss behavior. Superparamagnetic- like behavior persisting from 280 to 370 K further indicates that isolated magnetic clusters remain stable well into the nominally paramagnetic region. The presence of both phenomena highlights the crucial role of disorder-induced exchange randomness in stabilizing complex magnetic states in correlated perovskite oxides.
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@article{Pal2026Coexistence,
title = {Coexistence of Griffiths phase and superparamagnetic-like behavior in La-doped antiferromagnetic CaMnO3},
author = {Koustav Pal and Shuvendu Ghosh and N.N.S.V. Rama Raju and Chitrada Prasad and Kalipada Das and I. Das},
journal = {Materials Science and Engineering B},
year = {2026},
doi = {10.1016/j.mseb.2026.119875},
url = {https://doi.org/10.1016/j.mseb.2026.119875}
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