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Roles of Lifshitz transition on thermodynamics and superconductivity in La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub>

ORAL

Abstract

The effect of Lifshitz transition on thermodynamics and superconductivity in hole-doped cuprates has been heavily debated but remains an unanswered question. In particular, an observed maximum of electronic specific heat is proposed to originate from a quantum critical point associated with the Lifshitz transition. Here, we report an in situ angle-resolved photoemission spectroscopy study of three-dimensional Fermi surfaces in La2-xSrxCuO4 thin films (x = 0.06 – 0.35). With accurate kz dispersion quantification, the Lifshitz transition is determined to happen across a finite range x = 0.20 – 0.21. Normal state electronic specific heat, calculated from spectroscopy-derived band parameters, agrees with previous thermodynamic microcalorimetry measurements within experimental error. A d-wave superconducting gap smoothly across the Lifshitz transition demonstrates the insensitivity of superconductivity to the dramatic density of states enhancement.

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Presenters

  • YONG ZHONG

    Lawrence Berkeley National Laboratory, Stanford University

Authors

  • YONG ZHONG

    Lawrence Berkeley National Laboratory, Stanford University

  • Zhuoyu Chen

    Stanford University, Stanford Univ

  • Sudi Chen

    Stanford Univ, Stanford University

  • Kejun Xu

    Stanford University, Geballe Laboratory for Advanced Materials, Stanford University, USA

  • Makoto Hashimoto

    SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, SLAC National Accelerator Lab

  • Shin-ichi Uchida

    Univ of Tokyo

  • Donghui Lu

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, SLAC National Accelerator Lab

  • Sung-Kwan Mo

    Lawrence Berkeley National Laboratory

  • Zhixun Shen

    Stanford University, Geballe Laboratory for Advanced Materials, Stanford University, USA, Stanford Univ