Ba${4}$Ru${3}$O${10}的反铁磁序及其对输运财产的影响$ Antiferromagnetic order and consequences on the transport properties of Ba$_{4}$Ru$_{3}$O$_{10}$

作者:Yannick Klein Gwenaelle Rousse Françoise Damay Florence Porcher Gilles Andre Ichiro Terasaki

合成了钌酸钡Ba${4}$Ru${3}$O${10}$,其中Ru${3}$O$12}$三聚体连接在一起形成了格子二维框架,并研究了其在300K和2K之间的结构、磁性和输运财产。磁化率曲线上证明的$T_N\sim 105$K的顺磁到反铁磁跃迁与输运测量中电子局域化的增加相一致。热电能和霍尔系数测量都在$T_N$处表现出显著的变化,这是费米能级附近能带结构重建的特征。在该化合物的TN处没有观察到明显的结构变化。低于$T_N$的中子粉末衍射图案上的磁散射信号较弱,但可以用三聚体两端自旋的反铁磁有序来初步建模,更对称的Ru位点的自旋保持空闲。Ru$^{4+}处的晶体场和强自旋轨道耦合

Barium ruthenate Ba$_{4}$Ru$_{3}$O$_{10}$, in which Ru$_{3}$O$_{12}$ trimers are connected together to form a chequered two-dimensional framework, has been synthesised and its structural, magnetic and transport properties studied between 300 K and 2 K. The paramagnetic to antiferromagnetic transition at $T_N \sim 105$ K evidenced on the susceptibility curve coincides with an increase of electron localization in transport measurements. Thermoelectric power and Hall coefficient measurements both exhibit dramatic changes at $T_N$, characteristic of a reconstruction of the bands structure near the Fermi level. No pronounced structural changes are observed at TN in this compound. The magnetic scattering signal on the neutron powder diffraction patterns below $T_N$ is weak, but can be tentatively modelled with an antiferromagnetic ordering of the spins at both ends of a trimer, the spin of the more symmetric Ru site remaining idle. Crystal field and strong spin-orbit coupling at the Ru$^{4+}$ site seem to be the key parameters to understand the magnetic state of Ba$_{4}$Ru$_{3}$O$_{10}$.



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