NMR Study of the Mott Transitions to Superconductivity in the Two Cs3C60 Phases
NMR Study of the Mott Transitions to Superconductivity in the Two Cs3C60 Phases
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DOI：
10.1103/physrevlett.104.256402
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发表时间：
2010-06-23
影响因子：
8.6
通讯作者：
Ricco, M.
中科院分区：
文献类型：
--
作者：
Ihara, Y.;Alloul, H.;Ricco, M.
本文报道了膨胀型富勒烯嵌入物Cs_3C_（60）的A15和面心立方结构的核磁共振和磁学研究。NMR使我们能够证明，两者都表现出一阶莫特转变到超导状态，发生在不同的临界压力p（c）和温度T-c。虽然Mott相的基态磁性不同，但它们的高T顺磁和超导性质是相似的，并且与每C-60单位体积的相图是叠加的。因此，正如强关联系统所预期的那样，球间距离是驱动这些系统的电子行为和量子跃迁的相关参数。
We report a NMR and magnetometry study on the expanded intercalated fulleride Cs3C60 in both its A15 and face centered cubic structures. NMR allowed us to evidence that both exhibit a first-order Mott transition to a superconducting state, occurring at distinct critical pressures p(c) and temperatures T-c. Though the ground state magnetism of the Mott phases differs, their high T paramagnetic and superconducting properties are found similar, and the phase diagrams versus unit volume per C-60 are superimposed. Thus, as expected for a strongly correlated system, the interball distance is the relevant parameter driving the electronic behavior and quantum transitions of these systems.