Robustness of Non-Fermi-Liquid Behavior near the Ferromagnetic Critical Point in Clean ZrZn2
Robustness of Non-Fermi-Liquid Behavior near the Ferromagnetic Critical Point in Clean ZrZn2
复制标题
洁净 ZrZn2 中铁磁临界点附近非费米液体行为的稳健性
DOI：
10.1143/jpsj.76.043704
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发表时间：
2007
影响因子：
1.7
通讯作者：
H. Takagi
中科院分区：
文献类型：
--
作者：
S. Takashima;M. Nohara;H. Ueda;N. Takeshita;C. Terakura;F. Sakai;H. Takagi
测量了具有低剩余电阻率ρ 0 <$0.46 μΩ cm的弱巡游铁磁体ZrZn 2的电阻率ρ。ρ的T2-行为是费米液体的标志，不仅在铁磁临界点Pc = 2GPa附近，而且在整个研究的压力范围内，在低至1 K时都没有观察到。低温下ρ的温度依赖性从铁磁相的T5/3发展到顺磁相的T3/2。然而，这种变化非常微弱，很难捕捉到电阻率临界点的特征。费米液体在相当宽的相空间上的这种分解表明，在描述清洁金属的磁量子临界点时缺乏某些成分。
Electrical resistivity ρ of a weak itinerant ferromagnet ZrZn 2 with a low residual resistivity ρ 0 ≃0.46 µΩ cm was measured under hydrostatic pressure P up to 3.2 GPa. T 2 -behavior of ρ, a hallmark of Fermi liquid, was not observed down to 1 K not only at around the ferromagnetic critical point P c ∼2 GPa but over an entire pressure range investigated. The temperature dependence of ρ at low temperatures evolved from T 5/3 in the ferromagnetic phase to T 3/2 in the paramagnetic phase. This change, however, was very weak and it was hard to capture the signature of critical point in the resistivity. Such a breakdown of Fermi liquid over a remarkably wide phase space indicates the lack of some ingredient in the description of magnetic quantum critical point in clean metals.