Relation between c-f hybridization and magnetic ordering in CeRu2Al10: An optical conductivity study of Ce(Ru1-xRhx)2Al10(x<0.05)
Relation between c-f hybridization and magnetic ordering in CeRu2Al10: An optical conductivity study of Ce(Ru1-xRhx)2Al10(x<0.05)
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CeRu2Al10中c-f杂化与磁有序的关系：Ce(Ru1-xRhx)2Al10(x<0.05)的光学电导率研究
DOI：
10.1103/physrevb.91.241120
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Kobayashi
中科院分区：
文献类型：
--
作者：
S. Kimura;H. Tanida;M. Sera;Y. Muro;T. Takabatake;T. Nishioka;M. Matsumura;R. Kobayashi
具有正交晶体结构的近藤半导体在27.3 K的相当高的温度下显示出不寻常的反铁磁有序，这比近藤温度低。在直接反映电子结构的光学电导率光谱[]中，沿三个主轴在约40 meV处观察到导电态和态之间的杂化间隙。然而，大约20兆电子伏特的额外峰值只沿轴线出现。增大到0.05 in时，磁矩从27.3 K略微减小到24 K，但磁矩的方向在轴与轴之间发生了变化。因此，光谱中的杂化间隙被强烈地抑制，但20 meV峰的强度仍然很强。这些结果表明，磁矩方向的变化源于杂化强度的降低。磁有序温度与杂化没有直接关系，但与沿轴观察到的20 meV的电荷激发有关。
A Kondo semiconductorwith an orthorhombic crystal structure shows unusual antiferromagnetic ordering at a rather high temperatureof 27.3 K, which is lower than the Kondo temperatureK. In optical conductivity [] spectra that directly reflect the electronic structure, ahybridization gap between the conduction andstates is observed at around 40 meV along the three principal axes. However, an additional peak at around 20 meV appears only along theaxis. By increasingto 0.05 in, thedecreases slightly from 27.3 to 24 K, but the direction of the magnetic moment changes from theaxis to theaxis. Thereby, thehybridization gap in thespectra is strongly suppressed, but the intensity of the 20 meV peak remains as strong as for. These results suggest that the change in the magnetic moment direction originates from a decrease in thehybridization intensity. The magnetic ordering temperatureis not directly related tohybridization but is related to the charge excitation at 20 meV observed along theaxis.