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

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.

arXiv comment16 pages, 7 figures, 32 references

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Cited by in corpus (2)

• Harmonic Magneto-dielectric Study in Doped Perovskites, and Double Perovskite
• Crystallite-size Dependent Harmonic Magneto-electricity in SmFeO3