arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1111.5666cond-mat.str-elcond-mat.supr-con
收藏

二维有机超导体中的量子自旋液体概念

Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors

R. T. Clay, S. Dayal, H. Li, S. Mazumdar

摘要:

kappa-(ET)_2X的反铁磁性可以在ET分子二聚体的1/2填充带内理解。我们认为,虽然这种有效的模型可以描述反铁磁性的存在下,这些材料的完整描述需要正确的载流子密度的一半每个分子。对于二聚和强烈受挫1/4填充晶格,我们表明,一个单线态配对共存的电荷有序发生,我们称之为配对电子晶体(PEC)。在这里,我们调查的1/4填充模型上的二聚晶格,显示AFM,PEC,和维格纳晶体发生的区域。我们指出,对于高阻挫材料如kappa-(ET)_2Cu_2(CN)_3和β '-EtMe_3Sb[Pd(dmit)_2]_2,我们认为它们在低温下是PEC,需要超越量子自旋液体的概念。

英文摘要:

The occurrence of antiferromagnetism in kappa-(ET)_2X can be understood within an effective 1/2-filled band with dimers of ET molecules containing one hole each. We argue that while this effective model can describe the presence of antiferromagnetism, a complete description for these materials requires the correct carrier density of one-half per molecule. For dimerized and strongly frustrated 1/4-filled lattices we show that a singlet-paired state coexisting with charge ordering occurs that we have termed the Paired Electron Crystal (PEC). Here we investigate the 1/4-filled model on a dimerized lattice, showing regions where AFM, PEC, and the Wigner-crystal occur. We point out the need to go beyond quantum spin liquid concepts for highly frustrated materials such as kappa-(ET)_2Cu_2(CN)_3 and beta'-EtMe_3Sb[Pd(dmit)_2]_2 which we believe are PECs at low temperatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑