Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor

Choi, Seokhwan; Choi, Hyoung Joon; Ok, Jong Mok; Lee, Yeonghoon; Jang, Won Jun; Lee, Alex Taekyung; Kuk, Young; Lee, SungBin; Heinrich, Andreas; Cheong, S.-W.; Bang, Yunkyu; Johnston, Steven; Kim, Jun Sung; Lee, Jhinhwan

doi:10.1103/physrevlett.119.227001

Cited by 23 publications

(19 citation statements)

References 36 publications

(69 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recently SP-STM has been used to visualizing AFM domain walls in some correlated system such as Fe 1+y Te and Fe base superconductors. 92,93 The twisting of AFM order parameters at domain walls could result in uncompensated moments, which could be visualized by magnetic imaging techniques. For example, the stray fields of the single layer uncompensated spins on the surface of Cr 2 O 3 were imaged by scanning nitrogen-vacancy (NV) center microscopy, which allowed to measure the reorientation of the AFM order parameter across the domain wall with sub-100 nm spatial resolution.…”

Section: Introduction To Afm Domains and Domain Wallsmentioning

confidence: 99%

Seeing is believing: visualization of antiferromagnetic domains

Cheong

Fiebig

et al. 2020

npj Quantum Mater.

Self Cite

View full text Add to dashboard Cite

Understanding and utilizing novel antiferromagnetic (AFM) materials has been recently one of the central issues in condensed matter physics, as well as in materials science and engineering. The relevant contemporary topics include multiferroicity, topological magnetism and AFM spintronics. The ability to image magnetic domains in AFM materials is of key importance for the success of these exciting fields. While imaging techniques of magnetic domains on the surfaces of ferro-(ferri)magnetic materials with, for example, magneto-optical Kerr microscopy and magnetic force microscopy have been available for a number of decades, AFM domain imaging is a relatively new development. We review various experimental techniques utilizing scanning, optical, and synchrotron X-ray probes to visualize AFM domains and domain walls, and to unveil their physical properties. We also discuss the existing challenges and opportunities in these techniques, especially with further increase of spatial and temporal resolution.

show abstract

Section: Introduction To Afm Domains and Domain Wallsmentioning

confidence: 99%

Seeing is believing: visualization of antiferromagnetic domains

Cheong

Fiebig

et al. 2020

npj Quantum Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Spin-polarized scanning tunneling microscopy (SP-STM) is one of the few available techniques that can in principle be used for atomic-scale imaging of underlying magnetic orders (16). However, it has so far mostly been applied to magnetic nanostructures (16)(17)(18)(19)(20)(21) and Fe-based systems (22)(23)(24).…”

mentioning

confidence: 99%

Atomic-scale fragmentation and collapse of antiferromagnetic order in a doped Mott insulator

et al. 2019

View full text Add to dashboard Cite

Disentangling the relationship between the insulating state with a charge gap and the magnetic order in an antiferromagnetic (AF) Mott insulator remains difficult due to inherent phase separation as the Mott state is perturbed. Measuring magnetic and electronic properties at the atomic length scales would provide crucial insight, but this is yet to be experimentally achieved. Here we use spectroscopic-imaging spin-polarized scanning tunneling microscopy (SP-STM) to visualize periodic spin-resolved modulations originating from the AF order in a relativistic Mott insulator Sr2IrO4, and study these as a function of doping. We find that near insulator-to-metal transition (IMT), the long-range AF order melts into a fragmented state with short-range AF correlations. Crucially, we discover that the short-range AF order is locally uncorrelated with the observed spectral gap magnitude. This strongly suggests that short range AF correlations are unlikely to be the culprit behind inhomogeneous gap closing and the emergence of pseudogap regions near IMT. Our work establishes SP-STM as a powerful tool for revealing atomic-scale magnetic information in complex oxides.A Mott insulator, characterized by localization of electrons due to strong electron-electron interactions (1), is typically accompanied by magnetic ordering (2-4). The antiferromagnetic (AF)

show abstract

“…1d (see also Figure S1 in SI) 13 . The exact origin of the FM phase in REdoped Ca122 compounds is still unclear, but the defects at the Fe/As sites, such as As deficiency or Fe excess, have been suggested to be a source of the FM phase in FeSCs 13,[20][21][22] .…”

Section: Figure 1 Shows Representative Results For the Superconductinmentioning

confidence: 99%

Manipulating superconducting phases via current-driven magnetic states in rare-earth-doped CaFe2As2

et al. 2018

View full text Add to dashboard Cite

Inhomogeneous superconductivity in rare-earth (RE)-doped CaFe 2 As 2 (Ca122) compounds leads to a novel state of matter in which the superconducting and magnetic states can be simultaneously controlled by using an electric current (I). Both La-and Ce-doped Ca122 single crystals show a very broad superconducting transition width (ΔT c) due to their non-bulk nature. Surprisingly, ΔT c becomes sharper or broader after an electric current larger than a threshold value (I t) is applied, with a concomitant change in the normal-state magnetism. The sharpened (broadened) ΔT c is accompanied by a decrease (an increase) in the amplitude of the ferromagnetic signals. The sensitive changes in the superconductivity and magnetism that occur when an external current is applied are related to the inhomogeneous electronic states that originate from the Fe magnetic state and/or self-organized superconducting/magnetic composites in Ca122 compounds. These discoveries shed new light on the role of Fe in Fe-based superconductors and will provide new ideas for the design of novel superconducting devices.

show abstract

Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor

Cited by 23 publications

References 36 publications

Seeing is believing: visualization of antiferromagnetic domains

Seeing is believing: visualization of antiferromagnetic domains

Atomic-scale fragmentation and collapse of antiferromagnetic order in a doped Mott insulator

Manipulating superconducting phases via current-driven magnetic states in rare-earth-doped CaFe2As2

Contact Info

Product

Resources

About