Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
Phys Rev Lett. 2010 Nov 12;105(20):206402. doi: 10.1103/PhysRevLett.105.206402. Epub 2010 Nov 9.
We observe charge-order fluctuations in the quasi-two-dimensional organic superconductor β''-(BEDT-TTF)2SF5CH2CF2SO3, both by means of vibrational spectroscopy, locally probing the fluctuating charge order, and by investigating the in-plane dynamical response by infrared reflectance spectroscopy. The decrease of the effective electronic interaction in an isostructural metal suppresses both charge-order fluctuations and superconductivity, pointing to their interplay. We compare the results of our experiments with calculations on the extended Hubbard model.
我们通过振动光谱法（局部探测动态变化的电荷有序）和红外反射光谱法（研究面内动态响应），观察到准二维有机超导体β''-(BEDT-TTF)2SF5CH2CF2SO3 中的电荷有序涨落。同构金属中有效电子相互作用的降低抑制了电荷有序涨落和超导性，表明它们之间存在相互作用。我们将实验结果与扩展 Hubbard 模型的计算结果进行了比较。
