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Noticias publicadas en Febrero, 2019
  • Martes, 12
  • Departamento de Física Aplicada logo

    SEMINARIO: " MAGNETISM AND SUPERCONDUCTIVITY AT THE ATOMIC SCALE"

     

     

    Impartido por: Carmen Rubio Verdú

    Fecha y hora: Miércoles 13 de febrero de 2019 a las 12:00h

    Lugar: Sala Polivalente del Departamento de Física Aplicada de la Facultad de ciencias Fase 2 (2ª Planta)

    Abstract:

    Magnetic anisotropy is the preference of an atom’s spin to be aligned along a certain spatial direction. The Scanning Tunneling Microscope (STM) gives access to such individual magnetic moments through low-temperature Scanning Tunneling Spectroscopy (STS). In this talk I will show how both the magnetic moment, which defines the atomic spin S, and the interactions with the metallic substrate govern the spectral properties of single atoms and molecules.

    A step further into the understanding of individual spins is to study their effect on a superconducting substrate. When a dilute amount of magnetic impurities is placed on top of a superconductor, they create a potential that locally distorts the Cooper pairs bath, while the mesoscopic superconducting characteristics remain unaltered [1]. The coupling of the impurity to the substrate create Yu-Shiba-Rusinov bound states [2-4], which can be studied down to the μeV energy range in STS measurements performed with superconducting STM tips.

    In the search of new superconducting materials, we find Transition Metal Dichalcogenides as a new platform of crystalline layered materials that can be isolated down to the single-layer limit. In this regard, single-layer NbSe2 [5] is envisioned as an ideal system for the study of superconductivity in two dimensions. We extracted the statistical distribution of the superconducting gap width and observed that it is well described by an asymmetric log-normal distribution which is indicative of emergent granularity in the presence of disorder, and reflects the multifractal nature of the superconductor eigenstates [6].

     

    [1] P. W. Anderson, “Theory of dirty superconductors,” Journal of Physics and Chemistry of Solids, 11, 26 (1959).

    [2] L. Yu, “Bound state in superconductors with paramagnetic impurities,” Acta Phys. Sin., 21, 75, (1965).

    [3] H. Shiba, “Classical Spins in Superconductors,” Prog. Theo. Phys., 40, 435 (1968).

    [4] A. I. Rusinov, “Superconductivity near a Paramagnetic Impurity,” ZhETF Prisma Redaktsiiu, 9, 146 (1968).

    [5] M. M. Ugeda, et al., Nature Physics 12, 92 (2016).

    [6] J. Mayoh and A. M. García-García, PRB 92, 174526 (2015).

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