Parasitic small-moment antiferromagnetism and nonlinear coupling of hidden order and antiferromagnetism in URu2Si2 observed by Larmor diffraction.
Parasitic small-moment antiferromagnetism and nonlinear coupling of hidden order and antiferromagnetism in URu2Si2 observed by Larmor diffraction.
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DOI：
10.1103/physrevlett.104.106406
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发表时间：
2009-09
影响因子：
8.6
通讯作者：
P. G. Niklowitz;P. G. Niklowitz;C. Pfleiderer;Thomas Keller;Thomas Keller;Matthias Vojta;Yingkai Huang;J. Mydosh
中科院分区：
文献类型：
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作者：
P. G. Niklowitz;P. G. Niklowitz;C. Pfleiderer;Thomas Keller;Thomas Keller;Matthias Vojta;Yingkai Huang;J. Mydosh
我们首次报道了在低温和高达18 kbar的压力下，结合Larmor和常规中子衍射，同时对高纯URu（2）Si（2）的晶格常数、晶格常数分布和反铁磁矩进行了显微测量。我们的数据定量地证明了URu（2）Si（2）的隐序（HO）中的小矩是纯寄生的。优良的实验条件下，我们实现了使我们能够解决HO和大矩反铁磁性（LMAF），在压力下稳定的过渡线，本质上是一阶和双临界点结束。因此，HO和LMAF必须具有不同的对称性，这支持HO的奇异场景，例如轨道电流，螺旋度顺序或多极顺序。
We report for the first time simultaneous microscopic measurements of the lattice constants, the distribution of the lattice constants, and the antiferromagnetic moment in high-purity URu(2)Si(2), combining Larmor and conventional neutron diffraction at low temperatures and pressures up to 18 kbar. Our data demonstrate quantitatively that the small moment in the hidden order (HO) of URu(2)Si(2) is purely parasitic. The excellent experimental conditions we achieve allow us to resolve that the transition line between HO and large-moment antiferromagnetism (LMAF), which stabilizes under pressure, is intrinsically first order and ends in a bicritical point. Therefore, the HO and LMAF must have different symmetry, which supports exotic scenarios of the HO such as orbital currents, helicity order, or multipolar order.