Atomic-Scale Andreev Probe of Unconventional Superconductivity

Wonhee Ko, Sang Yong Song, Jiaqiang Yan, Jose Lado, Petro Maksymovych

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

Recent emergence of low-dimensional unconventional superconductors and their exotic interface properties calls for new approaches to probe the pairing symmetry, a fundamental and frequently elusive property of the superconducting condensate. Here, we introduce the unique capability of tunneling Andreev reflection (TAR) to probe unconventional pairing symmetry, utilizing the sensitivity of this technique to specific Andreev reflections. Specifically, suppression of the lowest-order Andreev reflection due to quantum interference but emergence of the higher-order Andreev processes provides direct evidence of the sign-changing order parameter in the paradigmatic FeSe superconductor. TAR spectroscopy also reveals two superconducting gaps, points to a possibility of a nodal gap structure, and directly confirms that superconductivity is locally suppressed along the nematic twin boundary, with preferential and near-complete suppression of the larger energy gap. Our findings therefore enable new, atomic-scale insight into microscopic, inhomogeneous, and interfacial properties of emerging quantum materials.
AlkuperäiskieliEnglanti
Sivut8310-8318
Sivumäärä9
JulkaisuNano Letters
Vuosikerta23
Numero17
Varhainen verkossa julkaisun päivämäärä28 elok. 2023
DOI - pysyväislinkit
TilaJulkaistu - 13 syysk. 2023
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Sormenjälki

Sukella tutkimusaiheisiin 'Atomic-Scale Andreev Probe of Unconventional Superconductivity'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.
  • -: Lado Jose AT-palkka

    Lado, J.

    01/09/202031/08/2025

    Projekti: Academy of Finland: Other research funding

  • -: Lado Jose AT-kulut

    Lado, J., Hyart, T., Kumar, P. & Koch, R.

    01/09/202031/08/2023

    Projekti: Academy of Finland: Other research funding

Siteeraa tätä