Heavy Fermion State in YbIr<SUB>2</SUB>Zn<SUB>20</SUB>
Heavy Fermion State in YbIr<SUB>2</SUB>Zn<SUB>20</SUB>
复制标题
YbIr<SUB>2</SUB>Zn<SUB>20</SUB> 中的重费米子态
DOI：
10.1143/jpsj.78.123711
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发表时间：
2009
影响因子：
1.7
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
S. Yoshiuchi;R. Settai;K. Sugiyama;Y. Onuki;et al.
2009年10月23日接受; 2009年12月10日发表）我们测量了具有立方晶体结构的YbIr2Zn20的高场磁化强度和deHaas-vanAlphen（dHvA）振荡，以及电阻率和磁化率。有效磁矩为Yb 3O2的磁化率在低温下变得与温度无关，对于H k h110i，在Tmax为1/4 7：4 K处具有宽峰。相应的磁化强度表明，在Hm ¼ 120 kOe处发生了变磁跃迁，这与Ce和U基重费米子化合物中的T max与Hm关系一致。在dHvA实验中检测到4 - 27 m0的大回旋质量，并发现在磁场高于Hm120 kOe时会减少。在磁场作用下，电阻率服从费米液体关系式<$0 Ω AT~2，且fffiffi Δ p值随磁场的变化在Hm处有一个极大值.从目前的实验结果，连同4f-巡回能带计算的结果，发现4f电子的贡献，在YbIr_2Zn_20的重费米子态。
accepted October 23, 2009; published December 10, 2009) We measured the high-field magnetization and deHaas–vanAlphen (dHvA) oscillations for YbIr2Zn20 with a cubic crystal structure, together with the electrical resistivity and magnetic susceptibility. The magnetic susceptibility with an effective magnetic moment of Yb3þ becomes temperature-independent at low temperatures, with a broad peak at T max ¼ 7: 4 K for H k h110i. The corresponding magnetization indicates a metamagnetic transition at Hm ¼ 120 kOe, consistent with a T max vs Hm relation in the Ce-and U-based heavy fermion compounds. The large cyclotron masses of 4–27 m0 are detected in the dHvA experiment, and are found to be reduced at magnetic fields higher than Hm ¼ 120kOe. The resistivity follows the Fermi liquid relation ¼ 0 þ AT2 under magnetic field, and the ffiffiffi A p value is also found to have a maximum at Hm as a function of magnetic field. From the present experimental results, together with the results of 4f-itinerant energy band calculations, the 4f electrons are found to contribute to the heavy fermion state in YbIr2Zn20.