Crossover from Kondo semiconductor to metallic antiferromagnet with 5d-electron doping in CeFe2Al10
Crossover from Kondo semiconductor to metallic antiferromagnet with 5d-electron doping in CeFe2Al10
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从近藤半导体到 CeFe2Al10 中 5d 电子掺杂的金属反铁磁体的交叉
DOI：
10.1103/physrevb.104.144405
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
T. Takabatake
中科院分区：
文献类型：
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作者：
R. Tripathi;D. T. Adroja;M. R. Lees;A. Sundaresan;S. Langridge;A. Bhattacharyya;V. K. Anand;D.D. Khalyavin;J. Sannigrahi;G. Cibin;A. D. Hiller;R. I. Smith;H. C. Walker;Y. Muro;T. Takabatake
本文对电子掺杂体系进行了系统的研究。随着温度的升高，正交轴略有减小，而伴随着温度的变化，晶胞体积基本不变.非弹性中子散射，沿着与热和运输测量，揭示了近藤半导体，低温能隙，这是提出的一个后果的stronghybridization，被抑制由少量的Ir取代Fe和该系统采用金属基态的费米能级的态密度的增加。电荷或输运能隙比具有Ir取代的自旋能隙更快地塌陷（at）。磁化率、热容和μ子自旋弛豫的测量表明，系统在低于3.1（2）K的Néel温度下经历长程反铁磁有序。尽管Ce的三价态被Ce边X射线吸收近边光谱证实，但有序矩估计小于0.07（1）/Ce。这表明，在（= Ru和Os）中观察到的异常高的有序温度中起重要作用的杂化间隙可能不是这里看到的低磁序的开始所必需的。
We report a systematic study of the-electron-doped system. With increasing, the orthorhombicaxis decreases slightly while accompanying changes inandleave the unit cell volume almost unchanged. Inelastic neutron scattering, along with thermal and transport measurements, reveal that for the Kondo semiconductor, the low-temperature energy gap, which is proposed to be a consequence of stronghybridization, is suppressed by a small amount of Ir substitution for Fe and that the system adopts a metallic ground state with an increase in the density of states at the Fermi level. The charge or transport gap collapses (at) faster than the spin gap with Ir substitution. Magnetic susceptibility, heat capacity, and muon spin relaxation measurements demonstrate that the system undergoes long-range antiferromagnetic order below a Néel temperatureof 3.1(2) K for. The ordered moment is estimated to be smaller than 0.07(1)/Ce, although the trivalent state of Ce is confirmed by Ce-edge x-ray absorption near edge spectroscopy. It is suggested that thehybridization gap, which plays an important role in the unusually high ordering temperatures observed in(= Ru and Os), may not be necessary for the onset of magnetic order with a lowseen here in.