Magnetic and structural phase transitions in erbium at low temperatures and high pressures
Magnetic and structural phase transitions in erbium at low temperatures and high pressures
复制标题
低温高压下铒的磁性和结构相变
DOI：
10.1103/physrevb.84.144415
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发表时间：
2011
影响因子：
3.7
通讯作者：
S. Weir
中科院分区：
文献类型：
--
作者：
Sarah A Thomas;G. Tsoi;Lowell E. Wenger;Y. Vohra;S. Weir
在温度低至10 K，压力高达20 GPa的情况下，对多晶铒（Er）进行了电阻和晶体结构测量。在84 K以下，随着温度的降低，电阻斜率发生突变，这与Er矩的c轴调制（CAM）反铁磁（AFM）顺序有关。随着压力的增加，电阻斜率的温度发生变化，相应的AFM有序温度下降，直到在10.6 GPa以上消失。我们的高压同步x射线衍射研究证实，在类似压力下，电阻斜率变化消失，Er的hcp结构相转变为九层{alpha}-Sm结构相。这些结果表明，在高压和低温下，原子力显微镜中Er矩排序的消失与结构相变密切相关。
Electrical resistance and crystal structure measurements have been carried out on polycrystalline erbium (Er) at temperatures down to 10 K and pressures up to 20 GPa. An abrupt change in the slope of the resistance is observed with decreasing temperature below 84 K, which is associated with the c-axis modulated (CAM) antiferromagnetic (AFM) ordering of the Er moments. With increasing pressure the temperature of the resistance slope change and the corresponding AFM ordering temperature decrease until vanishing above 10.6 GPa. The disappearance of the slope change in the resistance occurs at similar pressures where the hcp structural phase of Er is transformed to a nine-layer {alpha}-Sm structural phase, as confirmed by our high-pressure synchrotron x-ray diffraction studies. These results suggest that the disappearance in the AFM ordering of Er moments is strongly correlated to the structural phase transition at high pressures and low temperatures.