We explored the electronic and magnetic properties of the lanthanide double perovskite Dy2FeCoO6 by combining magnetization, Raman and Mössbauer spectroscopy and neutron diffraction along with density functional theory (DFT) calculations. Our magnetization measurements revealed two magnetic phase transitions in Dy2FeCoO6. First, a paramagnetic to antiferromagnetic transition at T N = 248 K and subsequently, a spin reorientation transition at T SR = 86 K. In addition, a field-induced magnetic phase transition with a critical field of H c ≈ 20 kOe is seen at 2 K. Neutron diffraction data suggested cation-disordered orthorhombic structure for Dy2FeCoO6 in Pnma space group which is supported by Raman scattering results. The magnetic structures ascertained through representational analysis indicate that at T N, a paramagnetic state is transformed to Γ5(Cx, Fy, Az) antiferromagnetic structure while, at T SR, Fe/Co moments undergo a spin reorientation to Γ3(Gx, Ay, Fz). The refined magnetic moment of (Fe/Co) is 1.47(4) μ B at 7 K. The antiferromagnetic structure found experimentally is supported through the DFT calculations which predict an insulating electronic state in Dy2FeCoO6.

中文翻译：

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反铁磁 Dy2FeCoO6 双钙钛矿中的自旋重定向

我们通过结合磁化、拉曼和穆斯堡尔光谱以及中子衍射以及密度泛函理论 (DFT) 计算来探索镧系元素双钙钛矿 Dy2FeCoO6 的电子和磁性。我们的磁化测量揭示了 Dy2FeCoO6 中的两个磁相变。首先，在 TN = 248 K 时发生顺磁性到反铁磁转变，随后在 T SR = 86 K 时发生自旋重定向转变。此外，在 2 K. 中子衍射数据表明 Dy2FeCoO6 在 Pnma 空间群中的阳离子无序正交结构，这得到了拉曼散射结果的支持。通过代表性分析确定的磁性结构表明，在 TN，顺磁状态转变为 Γ5(Cx, Fy, Az) 反铁磁结构，而在 T SR 处，Fe/Co 矩经历自旋重新定向为 Γ3(Gx, Ay, Fz)。(Fe/Co) 的精炼磁矩在 7 K 时为 1.47(4) μ B。实验发现的反铁磁结构通过 DFT 计算得到支持，该计算预测 Dy2FeCoO6 中的绝缘电子态。