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High-temperature charge density wave correlations in La1.875Ba0.125CuO4 without spin-charge locking.

H Miao1, J Lorenzana2, G Seibold3

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973; mdean@bnl.gov hmiao@bnl.gov.

Proceedings of the National Academy of Sciences of the United States of America
|November 9, 2017
PubMed
Summary

Charge density waves (CDWs) in superconducting cuprates are distinct. This study reveals that stripe order arises from coupled charge and spin density waves, unifying understanding across cuprate systems.

Keywords:
X-rayscharge density wavescuprateshigh-temperature superconductivitystripes

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Superconducting cuprates exhibit diverse low-temperature properties, complicating a unified understanding of charge-ordering phenomena.
  • Some cuprates display charge and spin stripes with locked periodicity, while others show charge density waves (CDWs) without clear spin order.

Purpose of the Study:

  • To investigate the evolution of charge correlations in the stripe-ordered cuprate La1.875Ba0.125CuO4.
  • To understand the relationship between charge and spin correlations in cuprates and their role in stabilizing order.

Main Methods:

  • Resonant inelastic X-ray scattering (RIXS) was employed to probe charge correlations.
  • The study focused on the canonical stripe-ordered cuprate La1.875Ba0.125CuO4 across its ordering transition.

Main Results:

  • High-temperature charge correlations were found to be unlocked from the spin correlation wavevector.
  • This decoupling suggests analogies to charge density wave (CDW) phases observed in other cuprates.

Conclusions:

  • Stripe order in La1.875Ba0.125CuO4 at low temperatures is stabilized by the coupling of independent charge and spin density waves.
  • This finding provides crucial insights into the interplay between charge and spin correlations in superconducting cuprates.