Paramagnons and high-temperature superconductivity in mercury-based cuprates

We present a comparative study of magnetic excitations in the first two Ruddlesden-Popper members of the Hg-family of high-temperature superconducting cuprates, which are chemically nearly identical and have the highest critical temperature (\(T_\mathrm{c}\)) among all cuprate families. Our inelasti...

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Bibliographic Details
Published in:arXiv.org 2020-11
Main Authors: Wang, Lichen, He, Guanhong, Yang, Zichen, Garcia-Fernandez, Mirian, Nag, Abhishek, Ke-Jin, Zhou, Minola, Matteo, Matthieu Le Tacon, Keimer, Bernhard, Peng, Yingying, Li, Yuan
Format: Article
Language:English
Subjects:
Comparative studies
Cuprates
High temperature
Inelastic scattering
Isotope effect
Mercury (metal)
Superconductivity
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Summary:We present a comparative study of magnetic excitations in the first two Ruddlesden-Popper members of the Hg-family of high-temperature superconducting cuprates, which are chemically nearly identical and have the highest critical temperature (\(T_\mathrm{c}\)) among all cuprate families. Our inelastic photon scattering experiments reveal that the two compounds' paramagnon spectra are nearly identical apart from an energy scale factor of \(\sim130\%\) that matches the ratio of \(T_\mathrm{c}\)'s, as expected in magnetic Cooper pairing theories. By relating our observations to other cuprates, we infer that the strength of magnetic interactions determines how high \(T_\mathrm{c}\) can reach. Our finding can be viewed as a magnetic analogue of the isotope effect, thus firmly supporting models of magnetically mediated high-temperature superconductivity.
ISSN:2331-8422
DOI:10.48550/arxiv.2011.05029