Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert

Trainer, Christopher; Yim, Chi Ming; McLaren, Martin; Wahl, Peter

doi:10.1063/1.4995688

Cited by 16 publications

(14 citation statements)

References 20 publications

(29 reference statements)

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“…Furthermore, the Hubbard Coulomb interaction on Ce-4 f electrons was incorporated to ensure a fully localized Ce-4 f state, which also gives a total magnetic moment of 2 μ B /Ce consistent with earlier studies on cerium monopnictides [35,40,41]. Although these compounds exhibit several field-induced magnetic phases, a ferromagneticlike state can be stabilized using state-of-the-art cryogenic STM in 3D vector magnetic fields above 4 T [35,41,42]. The topological analysis was performed by employing a real-space tightbinding model Hamiltonian, which was obtained by using the wien2wannier interface [43].…”

Section: Methodssupporting

confidence: 64%

Prediction of spin polarized Fermi arcs in quasiparticle interference in CeBi

et al. 2020

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We predict that CeBi in the ferromagnetic state is a Weyl semimetal. Our calculations within density functional theory show the existence of two pairs of Weyl nodes on the momentum path (0, 0, k z ) at 15 meV above and 100 meV below the Fermi level. Two corresponding Fermi arcs are obtained on surfaces of mirror-symmetric (010)-oriented slabs at E = 15 meV and both arcs are interrupted into three segments due to hybridization with a set of trivial surface bands. By studying the spin texture of surface states, we find the two Fermi arcs are strongly spin polarized but in opposite directions, which can be detected by spin-polarized ARPES measurements. Our theoretical study of quasiparticle interference (QPI) for a nonmagnetic impurity at the Bi site also reveals several features related to the Fermi arcs. Specifically, we predict that the spin polarization of the Fermi arcs leads to a bifurcation-shaped feature only in the spin-dependent QPI spectrum, serving as a fingerprint of the Weyl nodes.

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Section: Methodssupporting

confidence: 64%

Prediction of spin polarized Fermi arcs in quasiparticle interference in CeBi

et al. 2020

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“…The STM experiments were performed at 2 K using a low-temperature STM equipped with a vector magnet that enables application of magnetic fields of up to 5 T in any direction with respect to the tip-sample geometry ( 29 ). To obtain a pristine, impurity-free surface for imaging, Fe 1+ x Te samples were prepared by in situ cleaving at a temperature of ~20 K. Pt-Ir tips were conditioned by field emission on an Au(111) sample.…”

Section: Methodsmentioning

confidence: 99%

Manipulating surface magnetic order in iron telluride

et al. 2019

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Control of emergent magnetic orders in correlated electron materials promises new opportunities for applications in spintronics. For their technological exploitation, it is important to understand the role of surfaces and interfaces to other materials and their impact on the emergent magnetic orders. Here, we demonstrate for iron telluride, the nonsuperconducting parent compound of the iron chalcogenide superconductors, determination and manipulation of the surface magnetic structure by low-temperature spin-polarized scanning tunneling microscopy. Iron telluride exhibits a complex structural and magnetic phase diagram as a function of interstitial iron concentration. Several theories have been put forward to explain the different magnetic orders observed in the phase diagram, which ascribe a dominant role either to interactions mediated by itinerant electrons or to local moment interactions. Through the controlled removal of surface excess iron, we can separate the influence of the excess iron from that of the change in the lattice structure.

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“…Spin-polarized STM measurements were conducted on samples of Fe 1+x Te with excess iron concentrations x ranging from 5% to 11.5%. The measurements were performed using a home-built cryogenic STM operating at a base temperature of 2 K and mounted in a Vector magnet that is capable of 024406-2 applying a field of up to 5 T in any direction relative to the sample [62]. Atomically clean surfaces for STM measurement were prepared by cleaving the samples in situ at a temperature of ∼20 K [63].…”

Section: A Experimental Detailsmentioning

confidence: 99%

Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe

et al. 2021

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Fe 1+x Te is a two-dimensional van der Waals antiferromagnet that becomes superconducting on anion substitution on the Te site. The properties of the parent phase of Fe 1+x Te are sensitive to the amount of interstitial iron situated between the iron-tellurium layers. Fe 1+x Te displays collinear magnetic order coexisting with low-temperature metallic resistivity for small concentrations of interstitial iron x and helical magnetic order for large values of x. While this phase diagram has been established through scattering [see, for example, E. E.

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Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert

Cited by 16 publications

References 20 publications

Prediction of spin polarized Fermi arcs in quasiparticle interference in CeBi

Prediction of spin polarized Fermi arcs in quasiparticle interference in CeBi

Manipulating surface magnetic order in iron telluride

Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe

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