Complex transport and magnetism in inhomogeneous mixed valence Ce3Ir4Ge13
Complex transport and magnetism in inhomogeneous mixed valence Ce3Ir4Ge13
复制标题
非均匀混合价态 Ce3Ir4Ge13 中的复杂输运和磁性
DOI：
10.1103/physrevmaterials.3.114407
复制
发表时间：
2019
影响因子：
3.4
通讯作者：
Morosan, E.
中科院分区：
文献类型：
--
作者：
Hallas, A. M.;Huang, C. L.;Rai, Binod K.;Weiland, A.;McCandless, Gregory T.;Chan, Julia Y.;Beare, J.;Luke, G. M.;Morosan, E.
我们报告发现了具有一系列复杂结构、电子和磁性特性的 Remeika 相。我们的单晶 X 射线衍射测量表明，它形成于四方扭曲空间群中，该空间群具有三个不同的稀土位点。在 0.4 K 至 400 K 的三十年温度范围内，电阻率几乎与温度无关，而霍尔系数测量结果与低载流子半金属一致。磁化率测量揭示了一个有效磁矩，该磁矩明显低于预期值，这表明两个稀土位点被磁性占据，而第三个位点被非磁性占据。冷却后，首先进入下面的短程磁有序状态，其特征是磁化率与居里-维斯行为的偏差和广泛的与场无关的热容异常。在较低温度下，我们观察到第二个更尖锐的热容峰值，同时场冷却和零场冷却磁化率分裂。小的电阻率下降表明与磁有序或自旋冻结转变一致的自旋无序散射的损失。因此，这是具有复杂的热力学和输运性质的不均匀混合价化合物的罕见例子。
We report the discovery of, a Remeika phase with a complex array of structural, electronic, and magnetic properties. Our single crystal x-ray diffraction measurements show thatforms in the tetragonally distortedspace group, which has three distinct rare earth sites. The electrical resistivity is almost temperature independent over three decades in temperature, from 0.4 K to 400 K, while the Hall coefficient measurements are consistent with a low-carrier semimetal. Magnetic susceptibility measurements reveal an effective moment,, that falls significantly short of the expected value for, suggesting that two of the rare earth sites are occupied by magneticwhile the third is occupied by nonmagnetic. Upon cooling,first enters a short range magnetically ordered state below, marked by a deviation from Curie-Weiss behavior in susceptibility and a broad field-independent heat capacity anomaly. At lower temperatures, we observe a second, sharper peak in the heat capacity at, concurrent with a splitting of the field-cooled and zero-field-cooled susceptibilities. A small resistivity drop atsuggests a loss of spin disorder scattering consistent with a magnetic ordering or spin freezing transition.is therefore a rare example of an inhomogeneous mixed valence compound with a complex array of thermodynamic and transport properties.