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Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in La2−xSrxCuO4

Published inPhysical review. B, vol. 95, no. 1, 014514
Publication date2017-01-19
First online date2017-01-19
Abstract

The oxygen isotope (16O/18O) effect (OIE) on the pseudogap (charge-stripe ordering) temperature T* is investigated for the cuprate superconductor La2−xSrxCuO4 as a function of doping x by means of x-ray absorption near edge structure studies. A strong x dependent and sign reversed OIE on T* is observed. The OIE exponent αT* systematically decreases from αT* = −0.6(1.3) for x = 0.15 to αT* = −4.4(1.1) for x = 0.06, corresponding to increasing T* and decreasing superconducting transition temperature Tc. Both T*(16O) and T*(18O) exhibit a linear doping dependence with different slopes and critical end points [where T*(16O) and T*(18O) fall to zero] at xc(16O) = 0.201(4) and xc(18O) = 0.182(3), indicating a large positive OIE of xc with an exponent of αxc = 0.84(22). The remarkably large and strongly doping dependent OIE on T* signals a substantial involvement of the lattice in the formation of the pseudogap, consistent with a polaronic approach to cuprate superconductivity and the vibronic character of its ground state.

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Keywords
  • Dopants
  • Electronic structure
  • Isotope effect
  • Phase diagrams
  • Pseudogap
  • Superconducting gap
  • Cuprates
  • X-ray techniques
Affiliation Not a UNIGE publication
Research group
Citation (ISO format)
BENDELE, M. et al. Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in La<sub>2−x</sub>Sr<sub>x</sub>CuO<sub>4</sub>. In: Physical review. B, 2017, vol. 95, n° 1, p. 014514. doi: 10.1103/PhysRevB.95.014514
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ISSN of the journal2469-9950
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