Continuous collapse of antiferromagnetic order toward a quantum critical point in a single-component molecular material
Continuous collapse of antiferromagnetic order toward a quantum critical point in a single-component molecular material
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DOI：
10.1103/physrevb.106.205141
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发表时间：
2022-11
影响因子：
3.7
通讯作者：
K. Sunami;Taiga Takahashi;K. Miyagawa;Biao Zhou;Akiko Kobayashi;K. Kanoda
中科院分区：
文献类型：
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作者：
K. Sunami;Taiga Takahashi;K. Miyagawa;Biao Zhou;Akiko Kobayashi;K. Kanoda
我们利用核磁共振（NMR）光谱学揭示了环境压力下含有反铁磁（AFM）莫特绝缘体的单组分分子材料的电子态的压力变化。在高达8.5 kbar的压力下，观察到核磁共振波谱展宽和峰结构与自旋-晶格弛豫速率的温度依赖性，表明在此压力范围内AFM转变持续存在。然而，Neel温度和AFM磁矩不断降低，接近临界压力kbar。在10 kbar时，这些AFM特征在光谱中被抑制，而是呈现出向零温度的临界增加，符合二维AFM流动磁体的自一致重整化（SCR）理论[[1]，这也解释了更高压力下的系统变化。结果表明，在量子临界点kbar处，从原子力显微镜莫特绝缘体到顺磁性金属发生了压力诱导的量子相变。
We uncover the pressure variation of electronic states of the single-component molecular materialthat hosts the antiferromagnetic (AFM) Mott insulator at ambient pressure, usingnuclear magnetic resonance (NMR) spectroscopy. Under pressures up to 8.5 kbar, the NMR spectral broadening and the peak structure in the temperature dependence of the spin-lattice relaxation rateare observed and indicate that the AFM transition persists in this pressure range. However, the Neel temperature and the AFM magnetic moment are continuously decreased toward a critical pressure ofkbar. At 10 kbar, these AFM features in the spectra andare suppressed, and insteadexhibits a critical increase toward zero temperature, complying with the self-consistent renormalization (SCR) theory in two-dimensional AFM itinerant magnets [(], which also explains the systematic change ofat higher pressures. The present results indicate thatshows a pressure-induced quantum phase transition from the AFM Mott insulator to the paramagnetic metal at the quantum critical point ofkbar.