Contrasting electron-phonon interaction between electron- and hole-doped cuprates
arxiv(2024)
摘要
Spin- and charge-lattice interactions are potential key factors in the
microscopic mechanism of high-temperature superconductivity in cuprates.
Although both interactions can dramatically shape the low-energy electronic
structure, their phenomenological roles in superconductivity are usually
investigated independently. Employing angle-resolved photoemission
spectroscopy, we reveal the spectroscopic fingerprint of short-range
antiferromagnetic order in conjunction with enhanced electron-phonon
interaction in the electron-doped cuprate superconductor
Nd_1.85Ce_0.15CuO_4. The observed mode coupling exhibits a
strong momentum dependence that is in striking contrast to the node-antinode
dichotomy previously observed in the hole-doped cuprates. Our results reveal an
intimate relationship between electron-phonon coupling and antiferromagnetic
fluctuations, which collectively sets the stage for unconventional
superconductivity in the electron-doped cuprates.
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