Evolution of magnetic phases in single crystals of SrFe 1 − x Co x O 3 solid solution
Evolution of magnetic phases in single crystals of SrFe 1 − x Co x O 3 solid solution
复制标题
DOI：
10.1103/physrevb.86.064436
复制
发表时间：
2012-08
影响因子：
3.7
通讯作者：
Y. Long;Y. Kaneko;S. Ishiwata;Y. Tokunaga;Tomoyuki Matsuda;H. Wadati;Yoshiya Tanaka;Shik Shin;Y. Tokura;Y. Taguchi
中科院分区：
文献类型：
--
作者：
Y. Long;Y. Kaneko;S. Ishiwata;Y. Tokunaga;Tomoyuki Matsuda;H. Wadati;Yoshiya Tanaka;Shik Shin;Y. Tokura;Y. Taguchi
采用浮区法和高压氧退火相结合的方法合成了含高价离子（Fe ~（4+）/Co ~（4+））的SrFe_（1-x）Co_xO_3固溶体单晶。随着Co含量（x）的增加，基态从螺旋磁态（x = 0.2）改变，具有在245和337 K之间的高居里温度。我们发现，在helmagnetic状态（x <= 0.05），几个不同的磁相，这可能反映了多功能的三维螺旋秩序与多个波矢量，出现取决于温度和磁场强度。此外，我们观察到Co浓度依赖的复杂的磁相图的系统演化。共振软X-射线衍射测量显示，在朝向铁磁相的螺旋的波矢量逐渐减少。
Single crystals of SrFe1-xCoxO3 solid solution with high valence ions (Fe4+/Co4+) were synthesized by combining floating-zone and high-pressure oxygen-annealing techniques. As the Co content (x) is increased, the ground state changes from the helimagnetic state (x = 0.2), with a high Curie temperature ranging between 245 and 337 K. We found that, within the helimagnetic state (x <= 0.05), several different magnetic phases, which possibly reflect versatile three-dimensional helical orders with multiple wave vectors, emerge depending on temperature and magnetic field strength. In addition, we observed Co-concentration-dependent systematic evolution of the complex magnetic phase diagram. Resonant soft x-ray diffraction measurements revealed a gradual decrease in the wave vector of the helix toward the ferromagnetic phase.