Atomic fluctuations reveal phase transitions in underdoped YBCO

Glassy, fluctuating charge order is intertwined with superconductivity in underdoped YBa₂Cu₃O_6+y (YBCO). Here we report momentum-resolved measurements of slow atomic fluctuations using the x-ray photon correlation spectroscopy (XPCS) technique. We provide evidence of sensitivity to charge ordering, and surprisingly, to the onset of superconductivity. We discuss new insights into the complex phase competition in the cuprate superconductors.

*We acknowledge support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Contract DE-AC02- 76SF00515, both for the Materials Sciences and Engineering Division and for the Linac Coherent Light Source (LCLS), at the SLAC National Accelerator Laboratory, operated by Stanford University. J.J. Turner acknowledges support from the U.S. DOE, Office of Science, Basic Energy Sciences through the Early Career Research Program.

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Bulletin of the American Physical Society

2024 APS March Meeting

Monday–Friday, March 4–8, 2024; Minneapolis & Virtual

Session T16: Competing Orders in the Cuprate and Nickelate Superconductors

Abstract: T16.00004 : Atomic fluctuations reveal phase transitions in underdoped YBCO*

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