标题： 各向异性受挫锯齿链中磁结构和准粒子激发的压力演化 显示英文标题

标题： Pressure Evolution of Magnetic Structure and Quasiparticle Excitations in Anisotropic Frustrated Zigzag Chains

摘要： 具有各向异性交换相互作用的受挫磁性系统已被认为是发现奇特量子态和准粒子的关键平台。 在本研究中，我们报告了受挫半导体YbCuS2中磁结构和准粒子激发的压力演化，该材料由具有竞争交换相互作用的Yb3+锯齿链构成。 在常压下，YbCuS2在TN ~ 0.95 K处表现出磁相变，形成非公度螺旋磁序。 在1.6 GPa的静水压力下，TN增加到1.17 K，并且磁结构变为公度结构，可以视为奇宇称磁多极序。 值得注意的是，压力抑制了无隙准粒子激发。 这些发现表明，压力改变了Yb离子之间的交换相互作用，影响了磁基态和准粒子激发。 我们的结果突显了各向异性相互作用在二维性中的关键作用，以稳定复杂的量子相，为挫败、维度、多极和涌现准粒子之间的相互作用提供了见解。 显示英文摘要

摘要： Frustrated magnetic systems with anisotropic exchange interactions have been recognized as key platforms for discovering exotic quantum states and quasiparticles. In this study, we report the pressure evolution of magnetic structures and quasiparticle excitations in the frustrated semiconductor YbCuS2, characterized by Yb3+ zigzag chains with competing exchange interactions. At ambient pressure, YbCuS2 exhibits a magnetic transition at TN ~ 0.95 K, forming an incommensurate helical magnetic order. Under hydrostatic pressure of 1.6 GPa, TN increases to 1.17 K, and the magnetic structure changes to a commensurate one, which can be regarded as an odd-parity magnetic multipole order. Remarkably, pressure suppresses the gapless quasiparticle excitations. These findings suggest that pressure alters the exchange interactions between the Yb ions, affecting both the magnetic ground state and the quasiparticle excitations. Our results highlight the pivotal role of anisotropic interactions in one-dimensionality to stabilize the complex quantum phases, offering insights into the interplay among frustration, dimensionality, multipoles and emergent quasiparticles.