Observation of tunable single-atom Yu-Shiba-Rusinov states

Odobesko, Artem; Sante, Domenico Di; Kowalski, Alexander; Wilfert, Stefan; Friedrich, F.; Thomale, Ronny; Sangiovanni, Giorgio; Bode, Matthias

doi:10.1103/physrevb.102.174504

Cited by 42 publications

(46 citation statements)

References 47 publications

(49 reference statements)

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“…The electronic and magnetic structure of the considered and similar metallic systems can usually be well described by using the local density approximation (LDA) [ 9 , 10 , 26 , 27 ] or the generalized gradient approximation (GGA) [ 8 ] within DFT.…”

Section: Computational Detailsmentioning

confidence: 99%

“…The bulk lattice constant of

= 330.04 pm was considered. The GGA for the exchange-correlation potential was used as parametrized by Perdew, Burke and Ernzerhof [ 37 ] similarly as in [ 8 ], and the Brillouin zone was sampled by the

point only, due to the large size of the supercell. A vacuum region of more than 1 nm was considered in the surface normal [110] direction to avoid unphysical interactions between artificially repeated slabs inherent to the supercell method.…”

Section: Computational Detailsmentioning

confidence: 99%

“…Note that the geometry of the Mn adatom is identical to the one used in [ 7 ]. For the Fe/Nb system, the average vertical distance between the atoms in the two highest Nb layers decreased to 225.42 pm, and the Fe adatom relaxed to a vertical distance of 174.95 pm measured from its NN Nb atoms (170 pm in [ 8 ]). The spin magnetic moment of the Fe adatom was found to be 2.14 µ

(2.2 µ

in [ 8 ]).…”

Section: Computational Detailsmentioning

confidence: 99%

“…Beside significant advances in molecular metallic chains, so-called single chain magnets [1][2][3], this area has recently extended towards the investigation of magnetic-superconducting heterostructures, which may find applications in quantum computing. The presence of magnetic impurities on a superconducting surface leads to the emergence of so-called Yu-Shiba-Rusinov (YSR) states [4][5][6][7][8][9], due to the coupling of the localized magnetic moment to the Cooper pairs. In atomic chains, hybridized YSR states develop into bands [10,11], that can give rise to topological superconductivity and consequently to the appearance of Majorana bound states [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper, we investigate the magnetic properties of Mn and Fe adatoms, dimers, and monatomic chains on Nb(110) along different crystallographic directions. Mn and Fe adatoms, Mn dimers, and Mn chains have already been studied on Nb(110) [7,8,14,28], the magnetic properties of which are now systematically investigated from the theoretical side. Determining the magnetic properties of atomic chains from first principles is a long-standing challenge [25,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Electronic and Magnetic Properties of Building Blocks of Mn and Fe Atomic Chains on Nb(110)

et al. 2021

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We present results for the electronic and magnetic structure of Mn and Fe clusters on Nb(110) surface, focusing on building blocks of atomic chains as possible realizations of topological superconductivity. The magnetic ground states of the atomic dimers and most of the monatomic chains are determined by the nearest-neighbor isotropic interaction. To gain physical insight, the dependence on the crystallographic direction as well as on the atomic coordination number is analyzed via an orbital decomposition of this isotropic interaction based on the spin-cluster expansion and the difference in the local density of states between ferromagnetic and antiferromagnetic configurations. A spin-spiral ground state is obtained for Fe chains along the [11¯0] direction as a consequence of the frustration of the isotropic interactions. Here, a flat spin-spiral dispersion relation is identified, which can stabilize spin spirals with various wave vectors together with the magnetic anisotropy. This may lead to the observation of spin spirals of different wave vectors and chiralities in longer chains instead of a unique ground state.

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Section: Computational Detailsmentioning

confidence: 99%

“…The bulk lattice constant of

Section: Computational Detailsmentioning

confidence: 99%

(2.2 µ

in [ 8 ]).…”

Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electronic and Magnetic Properties of Building Blocks of Mn and Fe Atomic Chains on Nb(110)

et al. 2021

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Yu–Shiba–Rusinov states induced by single Fe atoms on reconstructed compound superconductor V3Si

Noßmann,

Yu,

Das

et al. 2024

Surface Science

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Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)

Goedecke

Schneider

et al. 2022

ACS Nano

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Two-dimensional (2D) magnet–superconductor hybrid systems are intensively studied due to their potential for the realization of 2D topological superconductors with Majorana edge modes. It is theoretically predicted that this quantum state is ubiquitous in spin–orbit-coupled ferromagnetic or skyrmionic 2D spin–lattices in proximity to an s -wave superconductor. However, recent examples suggest that the requirements for topological superconductivity are complicated by the multiorbital nature of the magnetic components and disorder effects. Here, we investigate Fe monolayer islands grown on a surface of the s -wave superconductor with the largest gap of all elemental superconductors, Nb, with respect to magnetism and superconductivity using spin-resolved scanning tunneling spectroscopy. We find three types of islands which differ by their reconstruction inducing disorder, the magnetism and the subgap electronic states. All three types are ferromagnetic with different coercive fields, indicating diverse exchange and anisotropy energies. On all three islands, there is finite spectral weight throughout the substrate’s energy gap at the expense of the coherence peak intensity, indicating the formation of Shiba bands overlapping with the Fermi energy. A strong lateral variation of the spectral weight of the Shiba bands signifies substantial disorder on the order of the substrate’s pairing energy with a length scale of the period of the three different reconstructions. There are neither signs of topological gaps within these bands nor of any kind of edge modes. Our work illustrates that a reconstructed growth mode of magnetic layers on superconducting surfaces is detrimental for the formation of 2D topological superconductivity.

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Observation of tunable single-atom Yu-Shiba-Rusinov states

Cited by 42 publications

References 47 publications

Electronic and Magnetic Properties of Building Blocks of Mn and Fe Atomic Chains on Nb(110)

Electronic and Magnetic Properties of Building Blocks of Mn and Fe Atomic Chains on Nb(110)

Yu–Shiba–Rusinov states induced by single Fe atoms on reconstructed compound superconductor V3Si

Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)

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