Mixed magnetic phases in tetragonal
Mixed magnetic phases in tetragonal
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四方混合磁相
DOI：
10.1088/0953-8984/10/17/020
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
T. Shigeoka
中科院分区：
文献类型：
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作者：
A. Garnier;D. Gignoux;D. Schmitt;T. Shigeoka
本文详细分析了在磁场作用下对四氢呋喃单晶进行的中子衍射实验。结果表明，零场低温磁相并不是Q =（3/13，0，0）传播矢量的自然补偿反相结构，而是一种混合相，其中26个Tb位中有两个的磁矩为零。多步变磁过程的前三个场感应相的磁结构与以前的分析一致，而第四场感应相不是非混合的建议，而是一个混合的一个与零场中的两个零力矩。与以前的解释相反，在4.7 K的比热和磁化率观察到的转变对应于从混合的低温磁结构到轻微调制的非混合磁结构的变化。数值模拟使我们能够解释所观察到的主要性质，并强调了晶体场的关键作用。
A careful analysis of neutron diffraction experiments under magnetic field performed on a single crystal of tetragonal is presented. It shows that the zero-field-low-temperature magnetic phase is not the natural compensated antiphase structure proposed so far for the Q = (3/13, 0, 0) propagation vector, but a mixed phase where the moment of two of the 26 Tb sites of the unit cell vanishes. The magnetic structures of the first three field induced phases of the multistep metamagnetic process agree with previous analysis whereas the fourth field induced phase is not the non-mixed proposed one but a mixed one with two zero moments as in zero field. Contrary to previous interpretations, the transition at 4.7 K observed by specific heat and susceptibility corresponds to the change of the magnetic structure from the mixed low-temperature one to a slightly modulated non-mixed one. Numerical simulation allowed us to account for the main properties observed and emphasizes the crucial role of the crystal field.