Rapid suppression of the energy gap and the possibility of a gapless hidden order state in URu 2−x Re x Si 2
Rapid suppression of the energy gap and the possibility of a gapless hidden order state in URu 2−x Re x Si 2
复制标题
URu 2−x Re x Si 2 中能隙的快速抑制和无能隙隐序态的可能性
DOI：
10.1080/14786435.2019.1600756
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发表时间：
2019
影响因子：
1.6
通讯作者：
Maple, M. B.
中科院分区：
文献类型：
--
作者：
Ran, S.;Schmiedeshoff, G. M.;Pouse, N.;Jeon, I.;Butch, N. P.;Adhikari, R. B.;Almasan, C. C.;Maple, M. B.
我们研究了与隐藏顺序（HO）相关联的能隙和Grüneisen比在URuReSisches使用组合的热膨胀系数和比热测量。当HO相变被抑制到较低温度时，能隙与HO转变温度之间的比率减小三倍。这种快速抑制的能隙可能会导致一个“无隙”HO状态的情况下，在HO相变温度被抑制到0 K之前，HO相的能隙消失。我们还研究了在Re取代基组合物附近的Grüneisen比，其中HO被抑制。Grüneisen比在x =0.12和0.15处表现出发散行为，为量子临界点的存在提供了证据，这与我们的“无隙”HO态的假设一致。
We investigated the energy gap associated with the hidden order (HO) phase and the Grüneisen ratio in the URuReSisystem using a combination of thermal expansion coefficient and specific heat measurements. As the HO phase transition is suppressed to lower temperature, the ratio between the energy gap and the HO transition temperature decreases three-fold. This rapid suppression of the energy gap potentially leads to a scenario of a ‘gapless’ HO state, in which the energy gap of the HO phase vanishes before the HO transition temperature is suppressed to 0 K. We also investigated the Grüneisen ratio in the vicinity of the Re substituent composition where the HO is suppressed. The Grüneisen ratio shows divergent behaviour atx=0.12 and 0.15, providing evidence for the existence of a quantum critical point, which is consistent with our hypothesis of a ‘gapless’ HO state.