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Spin Texture and Spin Dynamics in Superconducting Cuprates Near the Phase Transition Revealed by the Electron Paramagnetic Resonance

Abstract

A short review of experimental results and theoretical models of the spin texture and spin dynamics in superconducting cuprates near the phase transition developed on the basis of the EPR measurements is given. Distortions of the long-range antiferromagnetic order in the YBa\(_2\)Cu\(_3\)O\(_{6+y}\) were investigated for \(y=0.1-0.4\) using Yb\(^{3+}\) ions as the EPR probe. In weakly doped samples with \(y=0.1\), a strong anisotropy of the EPR linewidth is revealed which was related to the indirect spin–spin interaction between the ytterbium ions via antiferromagnetic spin-waves. In the case of the doping level \(y=0.2-0.3\), the EPR signal consists of narrow and broad lines, which were attributed to formation of charged domain walls. A theoretical analysis is well consistent with experimental results for the case of coplanar elliptical domain walls. A discussion of possible reasons for the observed unusual planar oxygen isotope effect on a critical temperature T\(_\mathrm {c}\) related to charge heterogeneity in underdoped cuprates is given.

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Acknowledgments

This work was funded by the subsidy allocated to Kazan Federal University for the project part of the state assignment in the sphere of scientific activities.

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Correspondence to B. I. Kochelaev.

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Kochelaev, B.I. Spin Texture and Spin Dynamics in Superconducting Cuprates Near the Phase Transition Revealed by the Electron Paramagnetic Resonance. J Low Temp Phys 185, 417–430 (2016). https://doi.org/10.1007/s10909-016-1602-0

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Keywords

  • Superconductivity
  • Antiferromagnetism
  • Cuprates
  • Phase separation
  • EPR