论文标题
压力引起的证据引起了耦合旋转梯子抗Fiferromagnet c $ _9 $ h $ _ {18} $ n $ _2 $ _2 $ cubr $ _4 $的证据
Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C$_9$H$_{18}$N$_2$CuBr$_4$
论文作者
论文摘要
量子物质中的量子相跃迁通过调整非热控制参数在不同的接地状态之间的零温度下发生。通常，它们可以在相变的兰道理论中准确描述，类似于常规的热相变。但是，在某些情况下，这张照片可能会崩溃。在这里，我们介绍了静液压压力对Spin-1/2梯子化合物C $ _9 $ H $ _ {18} $ n $ _2 $ _2 $ cubr $ _4 $的磁性结构和旋转动力学的影响的全面研究。单晶热容量和中子衍射测量结果表明，n $ \ rm \ acute {e} $ el排序相位通过连续的量子相变，超出了$ p _ {\ rm c} $ 1.0 GPA的临界压力的临界压力。对关键指数的估计表明，这种过渡可能属于传统的Landau范式。 1.3 GPA处的非弹性中子散射光谱的特征是两种良好的间隙模式，包括一种类似连续的模式和不同的散射通道中的另一种分辨率限制的激发，这进一步表明了$ p _ {\ rm c} $的外来量子量相差相位。
Quantum phase transitions in quantum matter occur at zero temperature between distinct ground states by tuning a nonthermal control parameter. Often, they can be accurately described within the Landau theory of phase transitions, similarly to conventional thermal phase transitions. However, this picture can break down under certain circumstances. Here, we present a comprehensive study of the effect of hydrostatic pressure on the magnetic structure and spin dynamics of the spin-1/2 ladder compound C$_9$H$_{18}$N$_2$CuBr$_4$. Single-crystal heat capacity and neutron diffraction measurements reveal that the N$\rm \acute{e}$el-ordered phase breaks down beyond a critical pressure of $P_{\rm c}$$\sim$1.0 GPa through a continuous quantum phase transition. Estimates of the critical exponents suggest that this transition may fall outside the traditional Landau paradigm. The inelastic neutron scattering spectra at 1.3 GPa are characterized by two well-separated gapped modes, including one continuum-like and another resolution-limited excitation in distinct scattering channels, which further indicates an exotic quantum-disordered phase above $P_{\rm c}$.
