Electronic states of alkali-doped CィイD260ィエD2 compounds : a NMR study

A systematic study of alkali-doped CイイD260イD2 compounds， AイD23イD2CイD260イD2 where A is a alkali metal， has been performed to clarify the electronic states， using nuclear magnetic resonance （NMR） technique。主要结果按以下顺序汇总：1.您的位置：知道173>> D1C-heper\coupling constants have been determined in the superconducting A> D23> D260> D2.2。在低温度（<100 K）下，对Korringa产品的增强，已经确定，显示了一个较弱的抗磁相关性。上升的温度和增加的晶格常数，对Korringa产品的增强，增加。这是对这个系统中的短电子表示自由路径的影响。Ammoniated A-D23-D260-D2 superconductors with expanded lattice constants show a "gap"-like be\ior in the temperature dependence of spin-lattice relaxation time T-D21-D2.5。It was shown that （NH3）K3C60 is described as a localized spin system in whole temperature studied （<300 K） and undergoes an antifer？magnetic transition at 45 K. 6。From these results， it was strongly sugested that the metallic state of AイイD23イエD260イエD2 is unstable to the local distortion around CイD260イエD2 molecules。

A systematic study of alkali-doped CィイD260ィエD2 compounds, AィイD23ィエD2CィイD260ィエD2 where A is a alkali metal, has been performed to clarify the electronic states, using nuclear magnetic resonance (NMR) technique. Main results are summarized as follows.1. The ィイD113ィエD1C-heperfine coupling constants have been determined in the superconducting AィイD23ィエD2CィイD260ィエD2.2. At, low temperatures (<100K), the enhancement of Korringa product, has been determined, which shows a weak antiferromagnetic correlation.3. Rising temperature and increasing lattice constant, the enhancement of Korringa product, increases. This was at atributed to the short electron mean free path in this system.4. Ammoniated AィイD23ィエD2CィイD260ィエD2 superconductors with expanded lattice constants show a "gap"-like behavior in the temperature dependence of spin-lattice relaxation time TィイD21ィエD2.5. It was shown that (NH3)K3C60 is described as a localized spin system in whole temperature studied (<300 K) and undergoes an antiferromagnetic transition at 45 K.6. From these results, it was strongly suggested that the metallic state of AィイD23ィエD2CィイD260ィエD2 is unstable to the local distortion around CィイD260ィエD2 molecules.