Magnetic behavior in a series of cerium ternary intermetallics: Ce2T2In (T=Ni, Cu, Rb, Pd, Pt, and An)
Magnetic behavior in a series of cerium ternary intermetallics: Ce2T2In (T=Ni, Cu, Rb, Pd, Pt, and An)
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DOI：
10.1103/physrevb.54.9891
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发表时间：
1996-10-01
影响因子：
3.7
通讯作者：
Hiebl, K
中科院分区：
文献类型：
--
作者：
Kaczorowski, D;Rogl, P;Hiebl, K
合成了一组三元Ce化合物Ce2T2In(T=Ni、Cu、Rh、Pd、Pt和Au)。单晶和粉末X射线衍射研究表明，所有这些相都以原始的Mo2FeB2型四方结构结晶。磁性测量(磁化强度、磁化率和交流磁化率)揭示了这些金属间化合物的物理性质主要由4f-d杂化决定。随着过渡金属d带的填充，Ce2T2In的基态由非磁性转变为良好的局域磁性。结果表明，Ce2Ni2In和Ce2Rh2In是中价体系，Ce2Pt2In是一个强烈的温度相关顺磁，而Ce2Cu2In、Ce2Pd2In和Ce2Au2在低温下按磁性顺序排列。电阻率的测量证实了Ce2Ni2In和Ce2Rh2In的中价行为。反过来，所研究的其余三元系的电阻率被发现是由近藤散射和晶体持有效应的相互作用决定的。对于Ce2Pt2In，由于强的近藤型相互作用，它的行为类似于自旋涨落系统，可能会出现非磁性的重费米子基态。
A group Of ternary cerium compounds Ce2T2In (T=Ni, Cu, Rh, Pd, Pt, and Au) has been synthesized. As found from single-crystal and powder x-ray-diffraction studies, all these phases crystallize in a primitive tetragonal structure of the Mo2FeB2 type. Magnetic measurements (magnetization, de and ac susceptibility) have revealed the physical properties of these intermetallics to be mainly governed by the 4f-d hybridization. Depending on the filling of the transition metal d band the ground state in Ce2T2In changes from a nonmagnetic to a well localized magnetic regime. It was proved that Ce2Ni2In and Ce2Rh2In are intermediate-valence systems, Ce2Pt2In is a strongly temperature-dependent paramagnet, whereas Ce2Cu2In, Ce2Pd2In, and Ce2Au2In order magnetically at low temperatures. Measurements of the electrical resistivity have corroborated the intermediate-valence behavior in Ce2Ni2In and Ce2Rh2In. In turn, the resistivity of the remaining ternaries studied was found to be determined by an interplay of Kondo scattering and crystal-held effects. For Ce2Pt2In which behaves like a spin-fluctuating system due to strong Kondo-type interactions a nonmagnetic heavy-fermion ground state probably occurs.