Separation of magnetic properties at uranium and cobalt sites in UCoAl using soft x-ray magnetic circular dichroism
Separation of magnetic properties at uranium and cobalt sites in UCoAl using soft x-ray magnetic circular dichroism
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使用软 X 射线磁圆二色性分离 UCoAl 中铀和钴位点的磁性
DOI：
10.1103/physrevb.88.075108
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发表时间：
2013
影响因子：
3.7
通讯作者：
and Zachary Fisk
中科院分区：
文献类型：
--
作者：
Yukiharu Takeda;Yuji Saitoh;Tetsuo Okane;Hiroshi Yamagami;Tatsuma D. Matsuda;Etsuji Yamamoto;Yoshinori Haga;Yoshichika Onuki;and Zachary Fisk
用软X射线磁性圆二色谱(XMCD)研究了超磁性UCoAl的磁性质与温度()和磁场()的关系。为了提取U位和Co位元素的特定磁性，分别在U4-5()和Co2-3()吸收边进行了XMCD实验。根据XMCD谱的形状确定了U和Co位的磁矩方向。U和Co位的总磁矩方向与方向(轴)平行，而U位的自旋磁矩方向与Co位的自旋磁矩方向相反。U位和Co位的XMCD强度ATK都急剧增加，对应于超磁转变。XMCD的强度不饱和，即使在上面的场致铁磁状态下也是如此。另外，Co位的XMCD强度增加比U位的小。通过比较在5.5K和5.5K下XMCD强度的依赖关系，我们发现Co原子的磁行为比U原子的磁行为有更强的依赖关系。
Temperature () and magnetic field () dependence of the magnetic properties in metamagnetic UCoAl have been investigated using a soft x-ray magnetic circular dichroism (XMCD). In order to extract element-specific magnetic properties at the U and Co sites, the XMCD experiment has been performed at the U 4-5() and Co 2-3() absorption edges, respectively. Directions of magnetic moments at the U and Co sites have been determined from shapes of the XMCD spectra. The directions of the total magnetic moments at the U and Co sites are parallel to thedirection (axis), but the direction of the spin magnetic moment at the U site is opposite to that at the Co site. The XMCD intensities at both the U and Co sites atK increase steeply atT (), corresponding to the metamagnetic transition. The XMCD intensities do not saturate, even in the field-induced ferromagnetic state above. In addition, the ratio of the increase of the XMCD intensity at the Co site is smaller than that at the U site. From comparison of thedependence of the XMCD intensities atand 5.5 K, we found that the magnetic behavior of the Co atom has a strongerdependence than that of the U atom.