Visualizing the electronic structure of infinite-layer cuprate by scanning tunnelling spectroscopy

ORAL

Abstract

Infinite layer Sr1-xLaxCuO2+δ is a prototype to study the high-Tc superconductivity in cuprates. Using oxide-MBE technique, we fabricate Sr1-xLaxCuO2+δ films with different doping levels. Mottness has been observed in lightly electron-doped Sr1-xLaxCuO2 by in-situ STM. We also find a phase transition to hole-doped Sr1-xLaxCuO2+δ when x exceeds 0.1. Apical oxygens are responsible for this electron- to hole-cuprate transition, which is supported by transmission electron microscope measurements. By comparing the electronic structures in electron- and hole-doped Sr1-xLaxCuO2+δ, we give some clues to understand the e-h asymmetry in cuprates.

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Presenters

  • Yong Zhong

    Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

Authors

  • Yong Zhong

    Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Ruifeng Wang

    Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Ziyuan Dou

    Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

  • CanLi Song

    Department of Physics, Tsinghua University, Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Xucun Ma

    Department of Physics, Tsinghua University, Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Qikun Xue

    Department of Physics, Tsinghua University, Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University