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arXiv 0805.2633cond-mat.str-elcond-mat.supr-con
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强关联物质中的电子对偶性

Electronic Duality in Strongly Correlated Matter

T. Park, M. J. Graf, L. Boulaevskii, J. L. Sarrao, J. D. Thompson

摘要:

超导性是从巡游电子之间的相互吸引作用发展而来的,这种相互吸引作用产生了电子对,电子对凝聚成宏观的量子态--超导态。另一方面,金属中的磁序产生于靠近离子核的电子,其相互作用由巡回电子介导。局域磁矩磁序和超导性之间的二分法提出了这两种状态是否可以共存并涉及相同的电子的问题。在这里,我们表明,单一的4f-电子的铈在CeRhIn 5同时产生磁性,本地化的特点,和超导性,需要巡回。4f电子的双重性质允许反铁磁有序和超导性的微观共存,其竞争通过压力和磁场的微小变化来调节。电子对偶性与传统的自旋密度磁性和超导性共存的解释形成对比,并为理解材料类中的复杂状态提供了新的途径。

英文摘要:

Superconductivity develops from an attractive interaction between itinerant electrons that creates electron pairs which condense into a macroscopic quantum state--the superconducting state. On the other hand, magnetic order in a metal arises from electrons localized close to the ionic core and whose interaction is mediated by itinerant electrons. The dichotomy between local moment magnetic order and superconductivity raises the question of whether these two states can coexist and involve the same electrons. Here we show that the single 4f-electron of cerium in CeRhIn5 simultaneously produces magnetism, characteristic of localization, and superconductivity that requires itinerancy. The dual nature of the 4f-electron allows microscopic coexistence of antiferromagnetic order and superconductivity whose competition is tuned by small changes in pressure and magnetic field. Electronic duality contrasts with conventional interpretations of coexisting spin-density magnetism and superconductivity and offers a new avenue for understanding complex states in classes of materials.

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。

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