Optimized unconventional superconductivity in a molecular Jahn-Teller metal.
Optimized unconventional superconductivity in a molecular Jahn-Teller metal.
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DOI：
10.1126/sciadv.1500059
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发表时间：
2015-04
期刊：
影响因子：
13.6
通讯作者：
Prassides K
中科院分区：
文献类型：
--
作者：
Zadik RH;Takabayashi Y;Klupp G;Colman RH;Ganin AY;Potočnik A;Jeglič P;Arčon D;Matus P;Kamarás K;Kasahara Y;Iwasa Y;Fitch AN;Ohishi Y;Garbarino G;Kato K;Rosseinsky MJ;Prassides K
超导圆顶是由非常规超导体分子构件的电子结构创建的。了解超导、邻近绝缘和高于 Tc 的正常金属态之间的关系是所有非常规超导体的主要挑战。分子 A3C60 富勒烯超导体具有与原子基铜酸盐相同的母体反铁磁绝缘体，但在这里，C603-电子结构通过分子上的 Jahn-Teller 效应控制结构构建单元的几何形状和自旋状态。我们将 Jahn-Teller 金属识别为局域 Jahn-Teller 活性电子和流动电子的波动微观异质共存，连接富勒烯的绝缘态和超导态。这些分子和费米能级电子的扩展晶格特征之间的平衡给出了具有富勒化物间分离的圆顶形 Tc 变化，证明了超导性的分子电子结构控制。
A superconductivity dome is created by the electronic structure of the molecular building block of an unconventional superconductor. Understanding the relationship between the superconducting, the neighboring insulating, and the normal metallic state above Tc is a major challenge for all unconventional superconductors. The molecular A3C60 fulleride superconductors have a parent antiferromagnetic insulator in common with the atom-based cuprates, but here, the C603– electronic structure controls the geometry and spin state of the structural building unit via the on-molecule Jahn-Teller effect. We identify the Jahn-Teller metal as a fluctuating microscopically heterogeneous coexistence of both localized Jahn-Teller–active and itinerant electrons that connects the insulating and superconducting states of fullerides. The balance between these molecular and extended lattice features of the electrons at the Fermi level gives a dome-shaped variation of Tc with interfulleride separation, demonstrating molecular electronic structure control of superconductivity.