Magnetically ordered Kondo lattice in YbNi2Ge2 at high pressure
Magnetically ordered Kondo lattice in YbNi2Ge2 at high pressure
复制标题
高压下 YbNi2Ge2 中的磁有序近藤晶格
DOI：
10.1088/0953-8984/13/48/318
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Flouquet
中科院分区：
文献类型：
--
作者：
G. Knebel;D. Braithwaite;G. Lapertot;P. Canfield;J. Flouquet
我们研究了YbNi_2Ge_2在100 kbar的静水压力下的电阻率。随着压力的增加，该系统被连续地从在低压下的中间价态调谐到在高压下的磁有序的近藤晶格。磁基态出现的临界压力接近50 kbar。低于Pc的电阻率显示T2依赖性，在低温下费米液体描述的特征。T2项的系数在接近Pc时急剧增加。在Pc以上，磁转变温度Tm随压力线性增加。高压下的磁电阻表明了铁磁耦合的重要性。
We have studied the electrical resistivity of YbNi2Ge2 under hydrostatic pressure up to 100 kbar. With increasing pressure the system is continuously tuned from an intermediate valence state at low pressure to a magnetically ordered Kondo lattice at high pressure. The critical pressure for the appearance of a magnetic ground state is near 50 kbar. Below Pc the resistivity shows a T2 dependence, characteristic of a Fermi liquid description at low temperatures. The coefficient of the T2 term increases drastically on approaching Pc. Above Pc, the magnetic transition temperature Tm increases linearly with pressure. The magnetoresistance at high pressure suggests the importance of ferromagnetic coupling.