Magnetic properties of the reentrant ferromagnetic superconductor HoMo6S8
Magnetic properties of the reentrant ferromagnetic superconductor HoMo6S8
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折返铁磁超导体HoMo6S8的磁性能
DOI：
10.1103/physrevb.24.3817
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发表时间：
1981
影响因子：
3.7
通讯作者：
D. Moncton
中科院分区：
文献类型：
--
作者：
J. Lynn;G. Shirane;W. Thomlinson;R. Shelton;D. Moncton
中子衍射和交流磁化率技术已用于研究三元 Chevrel 相系统 HoMo/sub 6/S/sub 8/ 中的磁性和超导相变。该材料首先在 T/sub c/1 = 1.82 K 时变得超导。随着温度的进一步降低，铁磁相关性不断发展，实空间中的相关范围随着温度的降低而增加。进一步冷却后，在超导相中形成长波长（约 230 A）振荡磁态（T/sub os/ = 0.71 K），其波长随着磁场的施加而增加。在更低的温度下，随着长程铁磁有序的开始，超导性被破坏（T/sub c/2/sup(C/) = 0.612 K）。低温下铁磁相的特征是饱和磁矩 ..mu../sub z/ = 9.06 +- 0.3 ..mu../sub B/，自旋沿着独特的 (111) 三角 轴。当材料从铁磁态加热时，似乎不会形成振荡磁相，系统在 T/sub c/2/sup(W/) = 0.668 K 时直接从铁磁态转变为超导态。
Neutron diffraction and ac susceptibility techniques have been used to study the magnetic and superconducting phase transitions in the ternary Chevrel phase system HoMo/sub 6/S/sub 8/. The material first becomes superconducting at T/sub c/1 = 1.82 K. With further decrease of temperature ferromagnetic correlations develop, with a correlation range in real space which increases with decreasing temperature. On further cooling, a long-wavelength (approx.230 A) oscillatory magnetic state forms (T/sub os/ = 0.71 K) in the superconducting phase, with a wavelength which increases with the application of a magnetic field. At still lower temperatures the superconductivity is destroyed (T/sub c/2/sup( C/) = 0.612 K) as long-range ferromagnetic order sets in. The ferromagnetic phase at low temperatures is characterized by a saturated magnetic moment ..mu../sub z/ = 9.06 +- 0.3 ..mu../sub B/, with the spins directed along the unique (111) trigonal axis. When the material is warmed from the ferromagnetic state, no oscillatory magnetic phase appears to form, with the system passing directly from ferromagnetism to superconductivity at T/sub c/2/sup( W/) = 0.668 K.