SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
Phys Rev Lett. 2013 Jun 28;110(26):265502. doi: 10.1103/PhysRevLett.110.265502. Epub 2013 Jun 25.
High resolution resonant inelastic x-ray scattering has been performed to reveal the role of lattice coupling in a family of quasi-1D insulating cuprates, Ca2+5xY2-5xCu5O10. Site-dependent low-energy excitations arising from progressive emissions of a 70 meV lattice vibrational mode are resolved for the first time, providing a direct measurement of electron-lattice coupling strength. We show that such electron-lattice coupling causes doping-dependent distortions of the Cu-O-Cu bond angle, which sets the intrachain spin exchange interactions. Our results indicate that the lattice degrees of freedom are fully integrated into the electronic behavior in low-dimensional systems.
高分辨率共振非弹性 X 射线散射已被应用于揭示晶格耦合在一系列准一维绝缘铜酸盐 Ca2+5xY2-5xCu5O10 中的作用。首次解析出源于晶格振动模式 70meV 连续发射的与位置相关的低能激发，为电子-晶格耦合强度提供了直接的测量。我们表明，这种电子-晶格耦合导致 Cu-O-Cu 键角的掺杂依赖性畸变，从而设定了链内自旋交换相互作用。我们的结果表明，在低维系统中，晶格自由度完全融入到电子行为中。
