Magnetic Excitation in Totally Symmetric Staggered Ordered Phase of PrFe4P12
Magnetic Excitation in Totally Symmetric Staggered Ordered Phase of PrFe4P12
复制标题
PrFe4P12 完全对称交错有序相的磁激发
DOI：
10.1143/jpsj.81.094711
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Iwasa
中科院分区：
文献类型：
--
作者：
Thuruthippallil;L.M.;Kim;E.Y.;Iwata;H.;松下正和;K. Iwasa
我们报告了 PrFe4P12 单晶样品的非弹性中子散射结果，该样品经历了从重电子相到反铁型非磁性有序相的转变。与在重电子相中观察到的准弹性磁响应相反，位于 1.5 和 3 meV 处的明确非弹性峰叠加在有序相中。对于原始Im\bar3结构，最大光谱强度出现在布里渊区中心，最小光谱强度出现在包括排序向量q0=(1,0,0)的区域边界处。在有序相中施加磁场时 1.5 meV 峰的演变与 4f 电子晶体场分裂能级之间的激发一致，而 3 meV 峰则迅速被抹掉。光谱与最近提出的具有良好定域f电子的Pr位点和类Kondo单线态的交错排序相一致，它们被表示为伴随载流子电荷调制的完全对称状态。
We report inelastic neutron scattering results for single-crystalline samples of PrFe4P12, which undergoes a transition from the heavy-electron phase to the antiferro-type nonmagnetic ordered phase. In contrast to the quasielastic magnetic response observed in the heavy electron phase, the well-defined inelastic peaks located at 1.5 and 3 meV are superimposed in the ordered phase. The maximum spectral intensity appears at the Brillouin zone center for the originalIm\bar3 structure, and the minimum spectral intensity appears at the zone boundaries including the ordering vectorq0=(1,0,0). The evolution of the 1.5 meV peak with an applied magnetic field in the ordered phase is in agreement with excitations between 4f-electron crystalline-field-splitting levels, while the 3 meV peak is smeared out rapidly. The spectra are consistent with the recently proposed staggered ordering of a Pr site with well-localizedf-electrons and that with a Kondo-singlet-like state, which are represented as the totally symmetric state accompanied by the charge modulation of carriers.