II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
Phys Rev Lett. 2011 Jul 8;107(2):027201. doi: 10.1103/PhysRevLett.107.027201. Epub 2011 Jul 5.
The metal-insulator transition occurring in hollandite K₂V₈O₁₆ has been studied by means of neutron and x-ray diffraction as well as by thermodynamic and electron-spin resonance measurements. The complete analysis of the crystal structure in the distorted phase allows us to identify dimerization as the main distortion element in insulating K₂V₈O₁₆. At low-temperature, half of the V chains are dimerized perfectly explaining the suppression of magnetic susceptibility due to the formation of spin singlets. The dimerization is accompanied by the segregation of charges into chains.
通过中子和 X 射线衍射以及热力学和电子自旋共振测量研究了发生在钙钛矿 K₂V₈O₁₆中的金属-绝缘体转变。对畸变相晶体结构的完整分析使我们能够将二聚化为绝缘 K₂V₈O₁₆中的主要畸变元素。在低温下，一半的 V 链完全二聚化，这完美解释了由于形成单重态自旋而导致磁化率的抑制。二聚化伴随着电荷向链的分离。
