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arXiv 1010.3140cond-mat.str-el
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重费米子金属中全同4 $f$态驱动的磁性和超导性

Magnetism and superconductivity driven by identical 4$f$ states in a heavy-fermion metal

Sunil Nair, O. Stockert, U. Witte, M. Nicklas, R. Schedler, K. Kiefer, J. D. Thompson, A. D. Bianchi, Z. Fisk, S. Wirth, F. Steglich

摘要:

磁性和超导性之间明显的敌对关系在广泛的材料类别中受到越来越多的关注,自由能景观使它们彼此非常接近。当这些相在显微镜下相互渗透时,情况尤其如此,尽管实现这一点的方式仍有待充分理解。在这里,我们提出了一个原型的重费米子系统,在其中观察到反铁磁性和超导性的弹性中子散射,磁输运和热容的联合测量。监测这些状态对另一个状态的存在以及外部热扰动和磁扰动的响应,指出它们可能来自费米表面的不同部分。这使得一个单一的4 $f$的状态是本地化和巡回,从而占磁性和超导性的共存。

英文摘要:

The apparently inimical relationship between magnetism and superconductivity has come under increasing scrutiny in a wide range of material classes, where the free energy landscape conspires to bring them in close proximity to each other. This is particularly the case when these phases microscopically interpenetrate, though the manner in which this can be accomplished remains to be fully comprehended. Here, we present combined measurements of elastic neutron scattering, magnetotransport, and heat capacity on a prototypical heavy fermion system, in which antiferromagnetism and superconductivity are observed. Monitoring the response of these states to the presence of the other, as well as to external thermal and magnetic perturbations, points to the possibility that they emerge from different parts of the Fermi surface. This enables a single 4$f$ state to be both localized and itinerant, thus accounting for the coexistence of magnetism and superconductivity.

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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