Polycrystalline Ruddlesden-Popper structure Ca3Mn2O7 synthesized using solid state technique has been structurally characterized with Synchrotron powder X-ray diffraction. Thermal evolution of octahedral distortions, responsible for transition to orthorhombic state from the parent tetragonal structure, has been explored down to 37K. Change in Mn-O-Mn bond angle connecting MnO6 octahedra have been established as responsible for the magnetic ordering in the system. This has been further confirmed with Raman spectroscopy, which demonstrates spin-lattice coupling. Dipole-relaxation characteristics revealed from dielectric spectroscopy underlie the inter-related spin, lattice, phonon, and charge degrees of freedom consistently in terms of genuine and intrinsic magneto-electricity of the system.

中文翻译：

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自旋、晶格、振动和电荷自由度的相互作用：Ca 3 Mn 2 O 7 中的磁介电性

使用固态技术合成的多晶 Ruddlesden-Popper 结构 Ca3Mn2O7 已通过同步加速器粉末 X 射线衍射进行了结构表征。八面体畸变的热演化，负责从母四方结构过渡到正交状态，已被探索到 37K。已确定连接 MnO6 八面体的 Mn-O-Mn 键角的变化是系统中磁性排序的原因。拉曼光谱进一步证实了这一点，拉曼光谱证明了自旋晶格耦合。介电光谱揭示的偶极弛豫特性是相互关联的自旋、晶格、声子和电荷自由度的基础，这些自由度在系统的真实和固有磁电方面始终如一。