Cooper-Pair Localization in the Magnetic Dynamics of a Cuprate Ladder
Abstract
We investigate the spin dynamics of the cuprate ladder SrCaCuO to elucidate the behavior of its intrinsically doped holes. Combining high-resolution neutron spectroscopy and density matrix renormalization group calculations enables a comprehensive analysis of the collective magnetic dynamics. We find a general absence of magnetic signatures from unpaired charges, indicating holes within the system form strongly bound localized Cooper pairs. A one-band Hubbard model fails to match the spectral features but a straightforward extension to a large attractive nearest-neighbor interaction quantitatively explains our results. Our finding shows the significance of additional interactions beyond the long-predicted quantum spin pairing in the (-wave) charge pairing process. Considering the parallels between ladders and two-dimensional cuprates, these results are potentially relevant for square lattices as well.
Cite
@article{arxiv.2501.10296,
title = {Cooper-Pair Localization in the Magnetic Dynamics of a Cuprate Ladder},
author = {A. Scheie and P. Laurell and J. Thomas and V. Sharma and A. I. Kolesnikov and G. E. Granroth and Q. Zhang and B. Lake and M. Mihalik and R. I. Bewley and R. S. Eccleston and J. Akimitsu and E. Dagotto and C. D. Batista and G. Alvarez and S. Johnston and D. A. Tennant},
journal= {arXiv preprint arXiv:2501.10296},
year = {2025}
}
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