Superconductivity Reinforces Charge-Density-Wave Phase Coherence across Cuprates
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914556808265728 |
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| author | Lee, H. Kuo, C. -T. Fujita, M. Kao, C. -C. Lee, J. -S. |
| author_facet | Lee, H. Kuo, C. -T. Fujita, M. Kao, C. -C. Lee, J. -S. |
| contents | For decades, superconductivity in high-Tc cuprates has been viewed as a competitor that suppresses charge-density-wave (CDW) order by reducing its amplitude and spatial extent. Here, we show that this picture is incomplete, as superconductivity is accompanied by a systematic enhancement of CDW phase coherence across multiple cuprate families. Using resonant soft x-ray scattering combined with a coherence-sensitive momentum-profile analysis, we uncover a BCS-like growth of phase coherence below Tc, which phenomenologically manifests as the absence of CDW peak broadening and near-perfect wave-vector locking. This enhancement remains visible even in a disorder-dominated regime created by long-term crystal aging and follows a common trend when compared with published data on Bi-, Hg-, Y-, and Nd-based cuprates. These results indicate that superconductivity reshapes CDW order in two distinct ways, suppressing its amplitude while strengthening its phase coherence, and reveal an additional phase-level interplay with lattice coupling in high-Tc cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_11401 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Superconductivity Reinforces Charge-Density-Wave Phase Coherence across Cuprates Lee, H. Kuo, C. -T. Fujita, M. Kao, C. -C. Lee, J. -S. Superconductivity For decades, superconductivity in high-Tc cuprates has been viewed as a competitor that suppresses charge-density-wave (CDW) order by reducing its amplitude and spatial extent. Here, we show that this picture is incomplete, as superconductivity is accompanied by a systematic enhancement of CDW phase coherence across multiple cuprate families. Using resonant soft x-ray scattering combined with a coherence-sensitive momentum-profile analysis, we uncover a BCS-like growth of phase coherence below Tc, which phenomenologically manifests as the absence of CDW peak broadening and near-perfect wave-vector locking. This enhancement remains visible even in a disorder-dominated regime created by long-term crystal aging and follows a common trend when compared with published data on Bi-, Hg-, Y-, and Nd-based cuprates. These results indicate that superconductivity reshapes CDW order in two distinct ways, suppressing its amplitude while strengthening its phase coherence, and reveal an additional phase-level interplay with lattice coupling in high-Tc cuprates. |
| title | Superconductivity Reinforces Charge-Density-Wave Phase Coherence across Cuprates |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2605.11401 |