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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >X-ray magnetic circular dichroism investigation of spin and orbital moments in Cr_8 and Cr_7Ni antiferromagnetic rings
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X-ray magnetic circular dichroism investigation of spin and orbital moments in Cr_8 and Cr_7Ni antiferromagnetic rings

机译：Cr_8和Cr_7Ni反铁磁环的自旋和轨道矩的X射线磁性圆二色研究。

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摘要

We investigated the electronic and magnetic properties of thick films of molecular {Cr_8} and {Cr_7Ni} anti-ferromagnetic rings by means of x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD). We determined the local symmetries, the electronic configuration, and the values of orbital and spin moments at the Cr and Ni sites of the molecular rings. XMCD measurements show that the correlation between the Cr and Ni spins in the {Cr_7Ni} molecular ring switches from antiferromagnetic to ferromagnetic with increasing temperature. Experimental data are interpreted using XMCD sum rules that allow the separate evaluation of the spin and the orbital contributions to the total magnetic moment of the ring as a function of temperature and magnetic field. The magnetic behaviors experimentally observed are compared with the results of spin-Hamiltonian calculations, based on microscopic parameters derived by inelastic-neutron scattering and low-temperature specific-heat measurements. The very good agreement between experimental data and calculations is a clear indication of the integrity of molecules. The temperature dependence of the ion magnetic moments results from the interplay between Zeeman and isotropic-exchange contributions, and is well captured by the theoretical model.
机译：我们通过X射线吸收光谱法和X射线磁性圆二色性（XMCD）研究了分子{Cr_8}和{Cr_7Ni}反铁磁环的厚膜的电子和磁性。我们确定了分子环的Cr和Ni位置的局部对称性，电子构型以及轨道矩和自旋矩的值。 XMCD测量结果表明，随着温度的升高，{Cr_7Ni}分子环中Cr和Ni自旋之间的相关性从反铁磁变为铁磁。实验数据使用XMCD和规则进行解释，该规则允许对自旋和轨道对环总磁矩的贡献分别进行评估，该自旋和轨道贡献是温度和磁场的函数。根据非弹性中子散射和低温比热测量得出的微观参数，将实验观察到的磁行为与自旋哈密顿计算的结果进行比较。实验数据与计算结果之间的很好一致性清楚地表明了分子的完整性。离子磁矩的温度相关性是由于塞曼和各向同性交换作用之间的相互作用而引起的，并且可以用理论模型很好地捕获。

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