Photoinduced phase transitions in cuprate superconductors: ordering vs. doping effects

ORAL

Abstract

Complex oxides posses an extremely rich phase diagram, in which the transitions between different ground states are triggered by small changes of the carrier density or by disorder. Interestingly, the interplay between these two mechanisms –and the resulting phase– can be externally manipulated by illumination. Despite the amount of work performed on cuprate superconductors, a clear picture of the mechanisms governing photo-induced effects has not emerged. In particular, whether doping or ordering effects are dominant has not been settled. Here we investigate that through light illumination effects in oxygen deficient YBa2Cu3O7-x thin films in which different degrees of disorder are induced through i) changes in the growth conditions (“quenching”) and ii) ion irradiation. Generally, light induces an increase in the superconducting critical temperature and in the carrier density coupled to a decrease in the normal state resistivity. However differences in the response of quenched and irradiated samples have been observed, which suggests that light-induced ordering may play an important role in the photoinduced effects.

*Work supported by the ERC grant N647100 and French ANR ANR-15-CE24-0008-01 and ANR-17-CE30-0018-04

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Presenters

  • Ralph El Hage

    • Unité Mixte de Physique, CNRS Thales, Université Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France

Authors

  • Ralph El Hage

    • Unité Mixte de Physique, CNRS Thales, Université Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France

  • Victor Rouco

    • Unité Mixte de Physique, CNRS Thales, Université Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France

  • Anke Sander

    • Unité Mixte de Physique, CNRS/Thales, Université Paris Sud, Université Paris-Saclay, Palaiseau, France
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France
    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris Saclay, Palaiseau, France
    • Unité Mixte de Physique, CNRS Thales, Université Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France

  • Fabian Cuellar

    • GFMC, Dpto. Física de Materiales, Universidad Complutense de Madrid, Spain
    • Universidad Complutense de Madrid. Spain
    • Grupo de Física de Materiales Complejos, Dpt. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain

  • David Sanchez Manzano

    • Grupo de Física de Materiales Complejos, Dpt. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain

  • Jacobo Santamaria

    • GFMC, Dpto. Física de Materiales, Universidad Complutense de Madrid, Spain
    • Universidad Complutense de Madrid. Spain
    • Grupo de Física de Materiales Complejos, Dpt. Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain

  • Javier Villegas

    • Unité Mixte de Physique, CNRS/Thales, Université Paris Sud, Université Paris-Saclay, Palaiseau, France
    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France
    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris Saclay, Palaiseau, France
    • Unité Mixte de Physique, CNRS Thales, Université Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France