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Three-dimensional charge density wave order in YBa2Cu3O6.67 at high magnetic fields
1Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA.
Charge density wave (CDW) correlations in cuprate superconductors exhibit distinct behaviors under high magnetic fields. A new study reveals a three-dimensional CDW emerging at low temperatures and high fields, linked to superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Charge density wave (CDW) correlations are a universal feature in cuprate superconductors.
- Previous studies using nuclear magnetic resonance and x-ray scattering showed discrepancies in CDW nature at high vs. low/zero fields.
Purpose of the Study:
- To characterize the charge density wave (CDW) in YBa2Cu3O6.67 under high magnetic fields.
- To investigate the relationship between CDW order and superconductivity in cuprates.
Main Methods:
- Utilized a pulsed magnet combined with an x-ray free-electron laser.
- Performed x-ray scattering measurements up to 28 tesla.
Main Results:
- Observed a two-dimensional CDW at zero field below ~150 Kelvin.
- Discovered a new three-dimensional CDW emerging at lower temperatures and fields above 15 tesla.
- The field-induced CDW appears near the superconducting transition temperature.
- The in-plane ordering vector of the CDW remained field-independent.
Conclusions:
- Two distinct forms of CDW order exist in YBa2Cu3O6.67.
- The field-induced CDW and the zero-field CDW are intimately linked to high-temperature superconductivity.
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