由草酸铜构成自旋阻挫分子磁体的电性化探索

1973年Anderson 从反铁磁相互作用的三角格子出发提出当两个格点上自旋反平行时，第三个格点自旋取向无法唯一确定，出现了自旋阻挫。导致电子可以共振价键的方式运动，而成为共振价键固体。当 S=1/2，源于量子纠缠形成量子自旋液体。1987年他指出Muller发现的铜氧超导体可看成是由 (4,4) 格子反铁磁体La2CuO4通过空穴掺杂而成，由绝缘体转变为超导体电子经历了自旋阻挫导致的量子自旋液体态。这已成为人们寻求新超导体的共识。虽然有机超导温度远低于无机超导，但两者在本质上是相同的。在多年从事分子导体和分子磁体工作的基础上，我们可从草酸铜基元构筑出自旋阻挫、无长程序的分子磁体，希望用“bottom up”的方法、改变对离子、达到对现有分子晶体进行“空穴掺杂”的目的，制备出新的电磁功能分子晶体，开展分子电子学和自旋电子学研究，发现新的量子自旋液体、超导体，并为量子计算做物质准备。

In 1973, Anderson proposed spin frustration from an extended triangular lattice with antiferromagnetic interaction with their nearest neighbors. When two neighboring spins align in opposite directions, the third one cannot. This leads the spin frustration. Depending on resonating-valence-bond theory of Pauling, he named it as Resonating-Valence-Bonds state. In 1987, Muller discovered superconductive behavior in cuprates. Anderson pointed out that (4,4) grid antiferromagnet La2CuO4 is the parent material of Cu-O superconductor, La2CuO4.becomes a superconductor after hole doping. The antiferromagnetic insulator transfers into superconductor through a spin frustrated quantum spin liquid state. It shows a way to looking for new superconductor. Although the critical temperature of organic superconductor is much lower than inorganic one, their intrinsic behavior is same. Depending on our work on organic conductor and molecular magnet, we found out the way to synthesis spin frustrated copper-oxalate-framework, and characterized them carefully on high quality single crystal. We could try to change the cation as “hole doping” to modulate its magnetism and conductivity and synthesis the new molecular crystal from “bottom.up” method. Then the research of molecular electronics, spintronics will be carried out to looking for new quantum spin liquid, new superconductor and get material ready to future quantum computation.