Vishvakarma Sonu, Srinivas V
Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
J Phys Condens Matter. 2021 Apr 28;33(20). doi: 10.1088/1361-648X/abe514.
We report a comprehensive study on the magnetic, electrical and thermal properties of Ni(= V, Cr, Nb,) alloys around their critical concentration. Analysis of field and temperature dependence magnetization data suggests a weak itinerant ferromagnetic behavior in= 8 and 10 compositions and the ferromagnetic ordering suppresses in the concentration range 10 << 12. Further, the temperature dependence of specific heat shows an unusual low temperature variation with an enhanced Sommerfeld coefficient,, with a signature of non-Fermi-liquid (NFL) behavior close to critical concentration. Further, the enhancement in Kadowaki-Woods ratio suggests it to be a strongly correlated electron system near critical concentration. Present analysis of experimental data consistently revealed that the NFL behavior is caused by spin fluctuations near critical concentration. The temperature dependencies of the electrical resistivity, the magnetization and linear term of the electronic specific heat appear to follow the theoretical predictions of a quantum phase transition and it is tempting to suggest that the presently studies Ni-rich alloys can be candidates for the observation of Griffith phase.
我们报告了一项关于Ni（=V、Cr、Nb）合金在其临界浓度附近的磁、电和热性能的综合研究。对场和温度依赖的磁化数据的分析表明，在=8和10的成分中存在弱巡游铁磁行为，并且在10<<12的浓度范围内铁磁有序被抑制。此外，比热的温度依赖性显示出异常的低温变化，具有增强的索末菲系数，，在接近临界浓度时具有非费米液体（NFL）行为的特征。此外，卡多瓦基-伍兹比率的增强表明它在临界浓度附近是一个强关联电子系统。对实验数据的当前分析一致表明，NFL行为是由临界浓度附近的自旋涨落引起的。电阻率、磁化强度和电子比热的线性项的温度依赖性似乎遵循量子相变的理论预测，并且很诱人地认为目前研究的富镍合金可以作为观察格里菲斯相的候选材料。
