论文标题
小说$ j _ {\ rm {eff}} $ = 3/2金属阶段和gata中的非常规超导性$ _4 $ se $ _8 $
Novel $J_{\rm{eff}}$=3/2 Metallic Phase and Unconventional Superconductivity in GaTa$_4$Se$_8$
论文作者
论文摘要
By means of density functional theory plus dynamical mean-field theory (DFT+DMFT) calculations and resonant inelastic x-ray scattering (RIXS) experiments, we investigate the high-pressure phases of the spin-orbit-coupled $J_{\rm{eff}}=3/2$ insulator GaTa$_4$Se$_8$.它的金属阶段是通过施加压力从莫特州衍生而来的，可携带$ j _ {\ rm {eff}}} = 3/2 $矩。 RIXS Spectrum中的特征激发峰将其破坏性量子干扰保持为$ J _ {\ rm {eff}} $，ta $ l_2 $ - gpa最高为10.4 gpa。我们基于旋转轨道耦合（旋转轨道耦合）的基于对角度的DFT+DMFT计算还表明，在高压下可以清楚地确定$ j _ {\ rm {eff}} = 3/2 $字符。这些结果建立了相关金属磁相的有趣性质，这代表了$ j _ {\ rm {eff}} $ = 3/2矩的第一个确认示例，该示例位于金属中。他们还表明，压力诱导的超导性可能是非常规的，并且受这些$ j _ {\ rm {eff}} = 3/2 $矩的影响。基于自能源分析，我们进一步提出了与自旋冻结跨界相关的掺杂诱导的超导性的可能性。
By means of density functional theory plus dynamical mean-field theory (DFT+DMFT) calculations and resonant inelastic x-ray scattering (RIXS) experiments, we investigate the high-pressure phases of the spin-orbit-coupled $J_{\rm{eff}}=3/2$ insulator GaTa$_4$Se$_8$. Its metallic phase, derived from the Mott state by applying pressure, is found to carry $J_{\rm{eff}}=3/2$ moments. The characteristic excitation peak in the RIXS spectrum maintains its destructive quantum interference of $J_{\rm{eff}}$ at the Ta $L_2$-edge up to 10.4 GPa. Our exact diagonalization based DFT+DMFT calculations including spin-orbit coupling also reveal that the $J_{\rm{eff}}=3/2$ character can be clearly identified under high pressure. These results establish the intriguing nature of the correlated metallic magnetic phase, which represents the first confirmed example of $J_{\rm{eff}}$=3/2 moments residing in a metal. They also indicate that the pressure-induced superconductivity is likely unconventional and influenced by these $J_{\rm{eff}}=3/2$ moments. Based on a self-energy analysis, we furthermore propose the possibility of doping-induced superconductivity related to a spin-freezing crossover.
