Correlation of the superconducting critical temperature with spin and orbital excitations in (CaxLa1x)(Ba1.75xLa 0.25+x)Cu3Oy as measured by resonant inelastic x-ray scattering

David Shai Ellis, Yao-Bo Huang, Paul Olalde-Velasco, Marcus Dantz, Jonathan Pelliciari, Gil Drachuck, Rinat Ofer, Galina Bazalitsky, Jorge Berger, Thorsten Schmitt, and Amit Keren
Phys. Rev. B 92, 104507 – Published 10 September 2015
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Abstract

Electronic spin and orbital (dd) excitation spectra of (CaxLa1x )(Ba1.75xLa0.25+x)Cu3Oy samples are measured by resonant inelastic x-ray scattering (RIXS). In this compound, Tc of samples with identical hole dopings is strongly affected by the Ca/Ba substitution x due to subtle variations in the lattice constants, while crystal symmetry and disorder as measured by linewidths are x independent. We examine two extreme values of x and two extreme values of hole-doping content y corresponding to antiferromagnetic and superconducting states. The x dependence of the spin-mode energies is approximately the same for both the antiferromagnetic and superconducting samples. This clearly demonstrates that RIXS is sensitive to the superexchange J even in doped samples. A positive correlation between J and the maximum of Tc at optimal doping (Tcmax) is observed. We also measured the x dependence of the dxydx2y2 and dxz/yzdx2y2 orbital splittings. We infer that the effect of the unresolved d3z2r2dx2y2 excitation on Tcmax is much smaller than the effect of J. There appears to be dispersion in the dxydx2y2 peak of up to 0.05 eV. Our fitting furthermore indicates an asymmetric dispersion for the dxz/yzdx2y2 excitation. A peak at 0.8 eV is also observed and attributed to a dd excitation in the chain layer.

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  • Received 31 December 2014
  • Revised 11 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.104507

©2015 American Physical Society

Authors & Affiliations

David Shai Ellis1, Yao-Bo Huang2,3, Paul Olalde-Velasco2, Marcus Dantz2, Jonathan Pelliciari2, Gil Drachuck1, Rinat Ofer1, Galina Bazalitsky1, Jorge Berger4, Thorsten Schmitt2, and Amit Keren1,*

  • 1Physics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel
  • 2Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 3Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Department of Physics and Optical Engineering, ORT-Braude College, P.O. Box 78, 21982, Karmiel, Israel

  • *keren@physics.technion.ac.il

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Vol. 92, Iss. 10 — 1 September 2015

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