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Destabilization of hidden order in URu 2 Si 2 under magnetic field and pressure
Nature Physics ( IF 19.6 ) Pub Date : 2020-06-08 , DOI: 10.1038/s41567-020-0927-4
W. Knafo , S. Araki , G. Lapertot , D. Aoki , G. Knebel , D. Braithwaite

The mystery of the hidden-order phase in the correlated electron paramagnet URu2Si2 is still unsolved. To address this problem, one strategy is to search for clues in the subtle competition between this state and neighbouring magnetically ordered states. It is now well established that long-range antiferromagnetic order can be stabilized in this metal when it is under pressure and that a spin-density wave manifests when a magnetic field is applied along the easy magnetic axis c. However, the full boundaries of the hidden-order phase in the pressure–magnetic-field plane have not been determined so far. Here we present a systematic investigation of URu2Si2 under combined high pressures and intense magnetic fields. The boundaries of the hidden-order, antiferromagnetic and spin-density-wave phases are mapped out, indicating an intricate three-dimensional phase diagram. We show that the field-induced spin-density-wave and hidden-order phases disappear in favour of antiferromagnetism at high pressure. Interestingly, a large number of phase boundaries are controlled by the field and pressure dependences of a single parameter. This gives new constraints for theories that model the electronic correlations and ordered phases in URu2Si2.



中文翻译:

磁场和压力下URu 2 Si 2中隐伏阶的失稳

相关的电子顺磁体URu 2 Si 2中的隐藏阶相的奥秘仍未解决。为了解决这个问题,一种策略是在该状态与相邻的磁有序状态之间的微妙竞争中寻找线索。现在已经很好地确定,当这种金属在压力下时,可以使该金属的远距离反铁磁阶稳定,并且当沿着易磁化轴c施加磁场时,就会出现自旋密度波。但是,到目前为止,还没有确定压力-磁场平面中隐藏顺序相的全部边界。在这里,我们对URu 2 Si 2进行系统研究在高压和强磁场共同作用下。映射出了隐藏阶,反铁磁和自旋密度波相位的边界,表明了复杂的三维相位图。我们表明,场感应的自旋密度波和隐藏阶数相在高压下消失,有利于反铁磁性。有趣的是,大量的相界是由单个参数的场和压力依赖性控制的。这为建模URu 2 Si 2中的电子相关性和有序相位的理论提供了新的约束。

更新日期:2020-06-08
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