Spin-lattice Coupling and Magneto-dielectricity in Ca3Mn2O7 Layered Perovskite

Pooja Sahlot; Gaurav Sharma; Vasant Sathe; Anand Mohan Awasthi

Spin-lattice Coupling and Magneto-dielectricity in Ca3Mn2O7 Layered Perovskite

Materials Science 2019-09-10 v6

Authors: Pooja Sahlot , Gaurav Sharma , Vasant Sathe , Anand Mohan Awasthi

Abstract

Dielectric study on Ca3Mn2O7 features relaxor-like segmented dynamics below the antiferromagnetic ordering. Dipolar relaxations of different origin are spectrally resolved exhibiting distinct H-field alterations. This identifies their allegiance to different magnetic sub-phases and establishes dual coupling of electrical, magnetic, and structural degrees of freedom. Further, strong spin-lattice coupling has been affirmed with Raman spectroscopy across the magnetic ordering. Short-range electrical correlations collaterally cause measurable harmonic dielectric response in the system. The \c{hi}_3^e-susceptibility signal yields genuine harmonic magneto-dielectricity, consistent with but exhibiting two orders of magnitude larger H-field effect, vis-\`a-vis that obtained in the fundamental dielectric constant {\epsilon}'.

Keywords

perovskite magnetism frustrated magnetism multiferroic

Cite

@article{arxiv.1812.01418,
  title  = {Spin-lattice Coupling and Magneto-dielectricity in Ca3Mn2O7 Layered Perovskite},
  author = {Pooja Sahlot and Gaurav Sharma and Vasant Sathe and Anand Mohan Awasthi},
  journal= {arXiv preprint arXiv:1812.01418},
  year   = {2019}
}

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13 pages, 4 figures, 25 references

Spin-lattice Coupling and Magneto-dielectricity in Ca3Mn2O7 Layered Perovskite

Abstract

Keywords

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