Absence of a spin-signature from a single Ho adatom as probed by spin-sensitive tunneling

Steinbrecher, Manuel; Sonntag, A.; Dias, Manuel dos Santos; Bouhassoune, Mohammed; Lounis, Samir; Wiebe, Jens; Wiesendanger, R.; Khajetoorians, Alexander A.

doi:10.1038/ncomms10454

Cited by 50 publications

(42 citation statements)

References 26 publications

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“…(1) corresponds to the interorbital exchange energy between the 4 f and mainly 5 d states of Ho, J fd m 5 d 22 , where J fd is ~0.1 eV 25 , and m 5 d is the magnetic moment of the 5 d states. As follows from the DFT and DFT+U calculations 3 as well as from our own calculations, the m 5 d does not exceed 0.1 μ B . It sets Δ ex = 10 meV as an energy scale for the J fd m 5 d .…”

Section: Theoretical Methods and Computational Detailssupporting

confidence: 70%

Magnetic character of holmium atom adsorbed on platinum surface

Shick

Shapiro

Kolorenč

et al. 2017

Sci Rep

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We address a recent controversy concerning the magnetic state of holmium adatom on platinum surface. Within a combination of the density functional theory (DFT) with the exact diagonalization (ED) of Anderson impurity model, the 〈J z〉 = 0 paramagnetic ground state |J = 8, J z = ±8〉 is found. In an external magnetic field, this state is transformed to a spin-polarized state with 〈J z〉 ≈ 6.7. We emphasize the role of 5d–4f interorbital exchange polarization in modification of the 4f shell energy spectrum.

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Section: Theoretical Methods and Computational Detailssupporting

confidence: 70%

Magnetic character of holmium atom adsorbed on platinum surface

Shick

Shapiro

Kolorenč

et al. 2017

Sci Rep

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“…We point out, however, that the lack of spin signature would also occur in the case of free moments, in which case the impurity would be transparent, as recently observed in Ref. 64 for Ho atoms adsorbed on Pt(111).…”

Section: Discussionsupporting

confidence: 57%

Competition between Kondo effect and RKKY physics in graphene magnetism

2017

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The cooperative behavior of quantum impurities on 2D materials, such as graphene and bilayer graphene, is characterized by a non-trivial competition between screening (Kondo effect), and Ruderman-Kittel-KasuyaYosida (RKKY) magnetism. In addition, due to the small density of states at the Fermi level, impurities may not couple to the conduction electrons at all, behaving as free moments. Employing a recently developed exact numerical method to study multi-impurity lattice systems, we obtain non-perturbative results that dramatically depart from expectations based on the conventional RKKY theory. At half-filling and for weak coupling, impurities remain in the local moment regime when they are on opposite sublattices, up to a critical value of the interactions when they start coupling anti-ferromagnetically with correlations that decay very slowly with interimpurity distance. At finite doping, away from half-filling, ferromagnetism is completely absent and the physics is dominated by a competition between anti-ferromagnetism and Kondo effect. In bilayer graphene, impurities on opposite layers behave as free moments, unless the interaction is of the order of the hopping or larger.

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“…Besides their potential in future storage technology, such atoms represent valuable model systems for investigating fundamental magnetic phenomena and conditions required for stable magnetic quantum states [1][2][3][4][5][6][7][8][9][10][11]. Rare-earth (RE) atoms possess an intrinsic large spinorbit interaction and their magnetic states are well decoupled from the environment.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of single rare-earth atoms on graphene/Ir(111)

et al. 2018

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We employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism to study the magnetic properties of single rare-earth (RE) atoms (Nd, Tb, Dy, Ho, and Er) adsorbed on the graphene/Ir(111) surface. The interaction of RE atoms with graphene results for Tb in a trivalent state with 4f n−1 occupancy, and in a divalent state with 4f n occupancy for all other studied RE atoms (n corresponds to the 4f occupancy of free atoms). Among the studied RE on graphene/Ir(111), Dy is the only one that shows magnetic hysteresis and remanence at 2.5 K. By comparing measured spectra and magnetization curves with multiplet calculations, we determine the energy diagram of the magnetic states and show for each element the magnetization reversal process that determines the timescale of its magnetic bistability.

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Absence of a spin-signature from a single Ho adatom as probed by spin-sensitive tunneling

Cited by 50 publications

References 26 publications

Magnetic character of holmium atom adsorbed on platinum surface

Magnetic character of holmium atom adsorbed on platinum surface

Competition between Kondo effect and RKKY physics in graphene magnetism

Magnetic properties of single rare-earth atoms on graphene/Ir(111)

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