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PreprintCC BY-NC-ND 4.0arXiv

Coexistence of Griffiths phase and superparamagnetic-like behavior in La-doped antiferromagnetic CaMnO3

  • Koustav Pal
  • Shuvendu Ghosh
  • N. N. S. V. Rama Raju
  • Chitrada Prasad
  • Kalipada Das
  • I. Das
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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 La0.19Ca0.81MnO3, 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 TG = 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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Cite

BibTeXRIS
BibTeX
@misc{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},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.22844},
  eprint = {2610.22844},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.22844},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Coexistence of Griffiths phase and superparamagnetic-like behavior in La-doped antiferromagnetic CaMnO3
AU  - Koustav Pal
AU  - Shuvendu Ghosh
AU  - N. N. S. V. Rama Raju
AU  - Chitrada Prasad
AU  - Kalipada Das
AU  - I. Das
PY  - 2026
DA  - 2026/10/16
PB  - arXiv
DO  - 10.48550/arxiv.2610.22844
UR  - https://arxiv.org/abs/2610.22844
AB  - 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_0.19Ca_0.81MnO_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.
ER  -