arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.09224cond-mat.mes-hall
收藏

探测$β$ $_2$ Pd超导体上Cr吸附原子间的磁相互作用

Probing magnetic interactions between Cr adatoms on the $β$-Bi$_2$Pd superconductor

Deung-Jang Choi, Carlos García Fernández, Edwin Herrera, Carmen Rubio-Verdú, Miguel M. Ugeda, Isabel Guillamón, Hermann Suderow, Jose Ignacio Pascual, Nicolás Lorente

摘要:

我们发现,超导体上的耦合原子二聚体的磁有序性是由它们的能隙内光谱特征揭示的。在超导体$β$ -Bi $_2$ Pd表面上的铬原子显示Yu-Shiba-Rusinov束缚态,在隧穿谱中被检测为成对的间隙内激发。我们通过原子操作形成Cr二聚体,发现它们的间隙内特征相对于单个原子出现移位或分裂。的光谱变化表明,二聚体的磁耦合的铁磁和反铁磁之间的变化取决于其在表面上的配置,在良好的协议与密度泛函理论模拟。这些结果证明超导带隙内态谱是一种精确的探测原子尺度结构磁有序性的工具。

英文摘要:

We show that the magnetic ordering of coupled atomic dimers on a superconductor is revealed by their intra-gap spectral features. Chromium atoms on the superconductor $β$-Bi$_2$Pd surface display Yu-Shiba-Rusinov bound states, detected as pairs of intra-gap excitations in the tunneling spectra. We formed Cr dimers by atomic manipulation and found that their intra-gap features appear either shifted or split with respect to single atoms. The spectral variations reveal that the magnetic coupling of the dimer changes between ferromagnetic and antiferromagnetic depending on its disposition on the surface, in good agreement with density functional theory simulations. These results prove that superconducting intra-gap state spectroscopy is an accurate tool to detect the magnetic ordering of atomic scale structures.

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。

↑