Ca3Ru2O7中柔性晶格的能力：通过各向异性磁致伸缩精细控制电输运
The power of flexible lattice in Ca3Ru2O7: Exquisite control of the electrical transport via anisotropic magnetostriction
摘要：
Ca_3Ru_2O_7是一个自旋-轨道耦合的关联体系，具有显著的各向异性。它既有趣又独特，主要是因为这种材料表现出相互矛盾的现象，这些现象往往与传统的先例完全不一致，特别是非金属态的量子振荡和通过避免完全自旋极化态实现的巨大磁阻。这项工作的重点是晶格和运输性能之间的关系，沿每个晶轴，并揭示了应用程序的磁场，H，沿不同的晶轴容易拉伸或收缩的晶格在一个单轴的方式，导致不同的电子状态。此外，适度压力的应用急剧放大了各向异性磁弹性效应，导致在H||硬轴或重进入非金属状态在H||易轴Ca 3Ru 2 O 7呈现出一种罕见的晶格相关的磁输运机制，其中非凡的晶格柔性使得能够通过磁拉伸或收缩晶轴来精确控制电子状态，并且自旋极化起着非常规的作用，不利于最大化电导率。这个有趣的物理学的核心是导致奇异态的各向异性磁致伸缩。
英文摘要：
Ca3Ru2O7 is a correlated and spin-orbit-coupled system with an extraordinary anisotropy. It is both interesting and unique largely because this material exhibits conflicting phenomena that are often utterly inconsistent with traditional precedents, particularly, the quantum oscillations in the nonmetallic state and colossal magnetoresistivity achieved by avoiding a fully spin-polarized state. This work focuses on the relationship between the lattice and transport properties along each crystalline axis and reveals that application of magnetic field, H, along different crystalline axes readily stretches or shrinks the lattice in a uniaxial manner, resulting in distinct electronic states. Furthermore, application of modest pressure drastically amplifies the anisotropic magnetoelastic effect, leading to either an occurrence of a robust metallic state at H || hard axis or a reentrance of the nonmetallic state at H || easy axis. Ca3Ru2O7 presents a rare lattice-dependent magnetotransport mechanism, in which the extraordinary lattice flexibility enables an exquisite control of the electronic state via magnetically stretching or shrinking the crystalline axes, and the spin polarization plays an unconventional role unfavorable for maximizing conductivity. At the heart of the intriguing physics is the anisotropic magnetostriction that leads to exotic states.
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