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Evolution of spin excitations from bulk to monolayer FeSe

Author

Listed:
  • Jonathan Pelliciari

    (Massachusetts Institute of Technology
    NSLS-II, Brookhaven National Laboratory)

  • Seher Karakuzu

    (Oak Ridge National Laboratory)

  • Qi Song

    (Fudan University)

  • Riccardo Arpaia

    (Politecnico di Milano
    Chalmers University of Technology)

  • Abhishek Nag

    (Diamond Light Source)

  • Matteo Rossi

    (Politecnico di Milano)

  • Jiemin Li

    (Diamond Light Source)

  • Tianlun Yu

    (Fudan University)

  • Xiaoyang Chen

    (Fudan University)

  • Rui Peng

    (Fudan University)

  • Mirian García-Fernández

    (Diamond Light Source)

  • Andrew C. Walters

    (Diamond Light Source)

  • Qisi Wang

    (Fudan University)

  • Jun Zhao

    (Fudan University)

  • Giacomo Ghiringhelli

    (Politecnico di Milano
    Politecnico di Milano)

  • Donglai Feng

    (Fudan University)

  • Thomas A. Maier

    (Oak Ridge National Laboratory
    Oak Ridge National Laboratory)

  • Ke-Jin Zhou

    (Diamond Light Source)

  • Steven Johnston

    (The University of Tennessee)

  • Riccardo Comin

    (Massachusetts Institute of Technology)

Abstract

In ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic spin fluctuations have been proposed to mediate SC making it essential to study the evolution of the spin dynamics of FeSe from the bulk to the ultrathin limit. Here, we investigate the spin excitations in bulk and monolayer FeSe/STO using resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to its bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems revealing a remarkable reconfiguration of spin excitations in FeSe/STO, essential to understand the role of spin fluctuations in the pairing mechanism.

Suggested Citation

  • Jonathan Pelliciari & Seher Karakuzu & Qi Song & Riccardo Arpaia & Abhishek Nag & Matteo Rossi & Jiemin Li & Tianlun Yu & Xiaoyang Chen & Rui Peng & Mirian García-Fernández & Andrew C. Walters & Qisi , 2021. "Evolution of spin excitations from bulk to monolayer FeSe," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23317-3
    DOI: 10.1038/s41467-021-23317-3
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    Cited by:

    1. Yuanhe Song & Zheng Chen & Qinghua Zhang & Haichao Xu & Xia Lou & Xiaoyang Chen & Xiaofeng Xu & Xuetao Zhu & Ran Tao & Tianlun Yu & Hao Ru & Yihua Wang & Tong Zhang & Jiandong Guo & Lin Gu & Yanwu Xie, 2021. "High temperature superconductivity at FeSe/LaFeO3 interface," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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