Evolution of plasmon excitations across the phase diagram of the cuprate superconductor <math>
  <mrow>
    <msub>
      <mi>La</mi>
      <mrow>
        <mn>2</mn>
        <mo>−</mo>
        <mi>x</mi>
      </mrow>
    </msub>
    <msub>
      <mi>Sr</mi>
      <mi>x</mi>
    </msub>
    <msub>
      <mi>CuO</mi>
      <mn>4</mn>
    </msub>
  </mrow>
</math>

M. Hepting; T. D. Boyko; V. Zimmermann; M. Bejas; Y. E. Suyolcu; P. Puphal; R. J. Green; L. Zinni; J. Kim; D. Casa; M. H. Upton; D. Wong; C. Schulz; M. Bartkowiak; K. Habicht; E. Pomjakushina; G. Cristiani; G. Logvenov; M. Minola; H. Yamase; A. Greco; B. Keimer

doi:10.1103/physrevb.107.214516

論文 Evolution of plasmon excitations across the phase diagram of the cuprate superconductor

{La}_{2 - x} {Sr}_{x} {CuO}_{4}

M. Hepting ; T. D. Boyko ; V. Zimmermann ; M. Bejas ; Y. E. Suyolcu ; P. Puphal ; R. J. Green ; L. Zinni ; J. Kim ; D. Casa ; M. H. Upton ; D. Wong ; C. Schulz ; M. Bartkowiak ; K. Habicht ; E. Pomjakushina ; G. Cristiani ; G. Logvenov ; M. Minola ; H. Yamase (National Institute for Materials Science) ; A. Greco ; B. Keimer

Doping_dependence_of_plasmons_in_LSCO.pdf

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M. Hepting, T. D. Boyko, V. Zimmermann, M. Bejas, Y. E. Suyolcu, P. Puphal, R. J. Green, L. Zinni, J. Kim, D. Casa, M. H. Upton, D. Wong, C. Schulz, M. Bartkowiak, K. Habicht, E. Pomjakushina, G. Cristiani, G. Logvenov, M. Minola, H. Yamase, A. Greco, B. Keimer. Evolution of plasmon excitations across the phase diagram of the cuprate superconductor

{La}_{2 - x} {Sr}_{x} {CuO}_{4}

. Physical Review B. 2023, 107 (21), 214516. https://doi.org/10.1103/physrevb.107.214516

(BibTeX)

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(abstract)

We use resonant inelastic x-ray scattering (RIXS) at the O K- and Cu K-edges to investigate the doping- and temperature dependence of low-energy plasmon excitations in La2−xSrxCuO4. We observe a monotonic increase of the energy scale of the plasmons with increasing doping x in the underdoped regime, whereas a saturation occurs above optimal doping x>0.16 and persists at least up to x=0.4. Furthermore, we find that the plasmon excitations show only a marginal temperature dependence, and possible effects due to the superconducting transition and the onset of strange metal behavior are either absent or below the detection limit of our experiment. Taking into account the strongly correlated character of the cuprates, we show that layered t-J-V model calculations accurately capture the increase of the plasmon energy in the underdoped regime.

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