Enhanced charge density wave with mobile superconducting vortices in La<sub>1.885</sub>Sr<sub>0.115</sub>CuO<sub>4</sub>
ORAL
Abstract
High-Tc cuprates exhibit a rich phase diagram featuring intertwined density wave orders and superconductivity. It is crucial to unravel the interactions between different orders to understand these important materials. Combining x-ray free electron laser with a pulsed magnet, we elucidate these interactions in a prototypical cuprate La1.885Sr0.115CuO4, by studying the charge density wave (CDW) and effects of large magnetic fields (H) up to 24 Tesla. We show the CDW peaks reveal two distinct regions in the material: a majority phase with short-range CDW coexisting with superconductivity, and a minority phase with longer-range CDW coexisting with static spin density wave (SDW). At low magnetic fields, the CDW intensity grows smoothly in a manner like the SDW. However, at high fields upon entering the vortex-liquid state, we discover a sudden increase in the CDW amplitude. Our result signifies a strong response of the CDW to mobile superconducting vortices, and further suggests an intimate connection between enhanced CDW amplitude and local superconducting pairing across the H-T phase diagram.
*This work is supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under contract DE-AC02-76SF00515. X-ray FEL studies were carried out at the Linac Coherent Light Source, a Directorate of SLAC and an Office of Science User Facility operated for the DOE, Office of Science by Stanford University. H.N. acknowledges the support by Grants-in-Aid for Scientific Research (KAKENHI) 23224009, International Collaboration Center-Institute for Materials Research, and MD-program. M.F. is supported by Grant-in-Aid for Scientific Research (A) (Grant No. 16H02125) and Scientific Research (C) (Grant No. 16K05460).
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Presenters
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Jiajia Wen
- SLAC - Natl Accelerator Lab