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Charge density wave memory in a cuprate superconductor.

X M Chen1,2, C Mazzoli3, Y Cao4

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA. xmchen@lbl.gov.

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|March 31, 2019
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Summary
This summary is machine-generated.

Charge density wave (CDW) domain patterns in superconducting cuprates show remarkable memory upon thermal cycling. This memory is lost only when the crystal structure fully recovers, revealing key lattice-charge coupling mechanisms.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Charge density waves (CDW) are common in superconducting cuprates.
  • Understanding CDW pinning to the lattice is crucial due to disparate material properties.

Purpose of the Study:

  • To investigate the reproducibility of CDW domain patterns in La$_{1.875}$Ba$_{0.125}$CuO$_{4}$ (LBCO 1/8) under thermal cycling.
  • To determine the relationship between structural transitions and CDW memory.

Main Methods:

  • Coherent resonant X-ray speckle correlation analysis was employed.
  • Thermal cycling was performed to observe changes in CDW domain patterns.

Main Results:

  • Remarkable reproducibility of CDW domain patterns was observed upon cycling to temperatures far above the CDW ordering temperature (54 K).
  • CDW memory was lost only upon cycling to 240(3) K, coinciding with the recovery of the CuO$_{2}$ planes' four-fold symmetry.
  • Structural features developing below 240 K dictate the CDW pinning landscape below 54 K.

Conclusions:

  • The study reveals a significant memory effect in CDW domain patterns within LBCO 1/8.
  • Lattice degrees of freedom play a critical role in pinning CDW order in superconducting cuprates, highlighting complex charge-lattice coupling.