Interplay of Spin, Lattice, and Charge Degrees of Freedom in Ca3Mn2O7

Pooja Sahlot; A. K. Sinha; A. M. Awasthi

doi:10.1111/jace.17013

Interplay of Spin, Lattice, and Charge Degrees of Freedom in Ca3Mn2O7

Materials Science 2020-04-24 v3

Authors: Pooja Sahlot , A. K. Sinha , A. M. Awasthi

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Abstract

From low-temperature Synchrotron X-ray diffraction, a precise thermal characterization of octahedral distortions in single phase Ruddlesden-Popper Ca3Mn2O7 is performed. Highly sensitive close-steps temperature dependences of Mn-O-Mn bond angles connecting MnO6 octahedra clearly reveal signature of the spin-ordering in the system. Spin-lattice coupling is thus established via the structural distortions responsible for evolution of the magnetic state. Further, temperature anomalies observed here in volume and polarization-measure of the unit cell highlight the interplay between spin, lattice and charge degrees of freedom. Dipole-relaxation characteristics examined under applied magnetic field consistently corroborate the concurrent magnetic and structural changes, in terms of genuine and intrinsic magneto-dielectricity.

Keywords

spin-lattice coupling charge degrees of freedom Ca3Mn2O7 Ruddlesden-Popper synchrotron x-ray diffraction magneto-dielectricity octahedral distortions

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@article{arxiv.1903.05995,
  title  = {Interplay of Spin, Lattice, and Charge Degrees of Freedom in Ca3Mn2O7},
  author = {Pooja Sahlot and A. K. Sinha and A. M. Awasthi},
  journal= {arXiv preprint arXiv:1903.05995},
  year   = {2020}
}

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16 pages, 7 figures, 32 references

Interplay of Spin, Lattice, and Charge Degrees of Freedom in Ca3Mn2O7

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