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Ferroelectricity in underdoped La-based cuprates.

Z Viskadourakis1,2, S S Sunku3, S Mukherjee4

  • 1Crete Center for Quantum Complexity and Nanotechnology, University of Crete, Heraklion 71003, Greece.

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|October 22, 2015
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This summary is machine-generated.

Ferroelectricity is common in lightly doped cuprates, offering insights into high-Tc superconductivity. This finding links local structural distortions and charge clustering to electronic properties in these complex materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Doping antiferromagnetic Mott insulators in cuprates induces electronic correlations and high-Tc superconductivity.
  • The nature of charge correlations in lightly doped cuprates and the intermediate electronic phase remain unclear.
  • Understanding this phase is crucial for elucidating complexity within and outside the superconducting dome, especially in the underdoped region.

Purpose of the Study:

  • To investigate the presence and origin of ferroelectricity in lightly doped La-214 cuprates.
  • To explore the relationship between ferroelectricity, magnetoelectric coupling, and high-Tc superconductivity.
  • To understand the role of local structural distortions and charge carrier clustering in these phenomena.

Main Methods:

  • Experimental synthesis and characterization of La-214 cuprate compounds (La2-xSrxCuO4, La2LixCu1-xO4, La2CuO4+x).
  • Investigation of ferroelectric properties and associated magnetoelectric coupling.
  • Analysis of local CuO6 octahedral distortions and charge carrier distribution.

Main Results:

  • Ferroelectricity and magnetoelectric coupling are demonstrated to be common in the studied La-214 cuprates.
  • Ferroelectricity is proposed to arise from local CuO6 octahedral distortions induced by dopants and charge carrier clustering.
  • These distortions break local spatial inversion symmetry, while magnetoelectric coupling can be tuned via Dzyaloshinskii-Moriya interaction.

Conclusions:

  • Ferroelectricity is an intrinsic property of lightly doped La-214 cuprates, not just a precursor to superconductivity.
  • Local structural modifications and charge ordering play a significant role in the electronic properties of these materials.
  • The findings provide a new perspective on the complex phase diagram of cuprates and the mechanisms underlying high-Tc superconductivity.