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Non-Fermi Liquid phenomena in heavy-fermion Ce compounds

重费米子 Ce 化合物中的非费米液体现象

基本信息

批准号：
09640413
负责人：
MURAYAMA Shigeyuki
金额：
$ 1.73万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640413/
关键词：
heavy-fermion system antiferromagnetism spin density wave Fermi-surface nesting Fermi liquid gap non-Fermi liquid SDW

项目摘要

Recent neuron diffraction experiment has shown that a system Ce(Ru_<1-x>Rh_2)Si_2, where Rh is substituted into the Ru site of paramagnetic heavy-fermion compound CeRu_2Si_2 with a large magnetic anisotropy along the c-axis, has an antiferromagnetic ordering for 0.05*x*0.3 with an incommensurate sinusoidal structure (the wave number and moment are along the c-axis).Thus, in the first step of this research project we measured the resistivity, specific heat and susceptibility of the present system. The results suggest that the Fermi-surface nesting occurs along the c-axis direction in the heavy quasi-particle band at the Neel temperature with Partial gap opening of the Fermi surface. Therefore, we conclude that the antiferromagnetism is due to the spin density wave (SDW) transition following the Fermi-surface nesting. We also measured the resistivity, specific heat and susceptibility of the present system in magnetic fields. The results suggest' that the gap collapse and the Fermi surface of the heavy fermion completely recovers into a paramagnetic Fermi liquid state.In the next step we measured the resistivity and susceptibility for .x=0.03, which is in the lower critical concentration region between the SDW and paramagnetic phases, . and for x=0.35, 0.375 and 0.40, which is in the higher critical concentration region. For x=0.03 Fermi-liquid like temperature dependence has been measured the susceptibility is temperature independent and the resistivity cc T^2 in the low temperature. On the other hand, for x = 0.35, 0.375 and 0.40 non-Fermi-liquid like temperature dependence has been observed : the susceptibility * -ROO<T> and the resistivity * T.Therefore, it is suggested that a non-Fermi-liquid phase exists in the higher critical Rh-concentration region of x *0.35 of this system.

最近的神经元衍射实验表明，在顺磁重费米子化合物CeU_2Si_2沿c轴具有较大磁各向异性的情况下，Ce(Ru_&lt；1-x&gt；Rh_2)Si_2系统具有0.05*x*0.3的反铁磁有序(波数和磁矩沿c轴)。因此，在本研究项目的第一步，我们测量了该系统的电阻率、比热和磁化率。结果表明，在Neel温度下，费米面沿c轴方向嵌套在重准粒子带中，费米面有部分空隙打开。因此，我们得出结论，这种反铁磁性是由于费米表面嵌套后的自旋密度波(SDW)相变造成的。我们还测量了该体系在磁场中的电阻率、比热和磁化率。结果表明，重费米子的能隙坍塌和费米面完全恢复到顺磁费米液相态。在下一步，我们测量了位于SDW和顺磁相之间的较低临界浓度区的x=0.03的电阻率和磁化率。对于x=0.375.35、0.3 5和0.4 0，在较高临界浓度范围内。对于x=0.03，测量了类费米液体的温度特性，磁化率与温度无关，低温下的电阻率cc T^2。另一方面，对于x=0.375.35、0.4 0和0.3 5，观察到了非费米液体的温度依赖关系：磁化率*-RoO&lt；T&Gt；和电阻率*T。因此，在x*0.35的较高临界Rh浓度区域存在非费米液体相。