标题： 对称与反对称应变调制Yb(In$_{1-x}$Ag$_x$)Cu$_4$中的价态转变 显示英文标题

标题： Symmetric versus antisymmetric strain tuning of the valence transition in Yb(In$_{1-x}$Ag$_x$)Cu$_4$

摘要： 与一系列关联量子材料中的转变类似，价态转变表现出与晶体晶格的强耦合，使其对压力调制非常敏感。 在本工作中，我们确定了单轴压力（破坏晶格对称性）对纯的和银取代的YbInCu$_4$的价态转变温度及其交叉温度的影响。 我们的主要结果是静水压力在调节此转变方面比单轴压力更有效。 基于应力引起的应变的对称性分解，我们认为，鉴于价态转变主要对对称应变和晶格体积变化敏感，这一现象可以定量地被理解。 这些结果支持这样的观点，即价态转变在其临界端点附近可能产生临界弹性。 显示英文摘要

摘要： Similar to transitions in a range of correlated quantum materials, the valence transition exhibits a strong coupling to the crystal lattice, rendering it highly sensitive to stress tuning. In the present work, we determine the effect of uniaxial stress, which breaks the lattice symmetry, on the valence transition temperature and its crossover temperature in pure and Ag-substituted YbInCu$_4$. Our key result is that hydrostatic stress is more effective in tuning this transition than uniaxial stress. Based on a symmetry decomposition of the stress-induced strains, we argue that this observation can be quantitatively understood, given that the valence transition is mostly sensitive to symmetric strains and thus volume changes of the lattice. These results support the notion that the valence transition can give rise to critical elasticity close to its critical endpoint.