Incommensurate spin-density-wave antiferromagnetism in CeRu2Al2B
Incommensurate spin-density-wave antiferromagnetism in CeRu2Al2B
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DOI：
10.1103/physrevb.93.060410
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发表时间：
2016-02-29
影响因子：
3.7
通讯作者：
Hillier, A. D.
中科院分区：
文献类型：
--
作者：
Bhattacharyya, A.;Khalyavin, D. D.;Hillier, A. D.
新发现的Ising型铁磁体CeRu 2Al 2B在T-C = 12.8K进入铁磁基态之前，在T-N = 14.2K处表现出额外的相变。我们通过高分辨率的中子衍射测量澄清这种转变的性质。结果表明，在T-C < T < T-N的温度范围内，存在纵向非公度自旋密度波（SDW）。传播矢量q类似于（0，0，0.148），在该区域几乎与温度无关，并且在T-C处不连续地锁定在q = 0。平均场计算的有效伊辛模型表明，调制SDW相稳定铁磁和反铁磁交换相互作用之间的强烈竞争。这使得CeRu_2Al_2B成为研究铁磁重费米子金属在磁阻挫影响下的全局相图的一个特别有吸引力的模型系统。
The newly discovered Ising-type ferromagnet CeRu2Al2B exhibits an additional phase transition at T-N = 14.2 K before entering the ferromagnetic ground state at T-C = 12.8 K. We clarify the nature of this transition through high resolution neutron diffraction measurements. The data reveal the presence of a longitudinal incommensurate spin-density wave (SDW) in the temperature range of T-C < T < T-N. The propagation vector q similar to (0,0,0.148) is nearly temperature independent in this region and discontinuously locks into q = 0 at T-C. Mean-field calculations of an effective Ising model indicate that the modulated SDW phase is stabilized by a strong competition between ferromagnetic and antiferromagnetic exchange interactions. This makes CeRu2Al2B a particularly attractive model system to study the global phase diagram of ferromagnetic heavy-fermion metals under the influence of magnetic frustration.