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Cooper-Pair Localization in the Magnetic Dynamics of a Cuprate Ladder

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arxiv 2501.10296 v1 pith:4OBFRGM6 submitted 2025-01-17 cond-mat.str-el cond-mat.supr-con

Cooper-Pair Localization in the Magnetic Dynamics of a Cuprate Ladder

A. Scheie , P. Laurell , J. Thomas , V. Sharma , A. I. Kolesnikov , G. E. Granroth , Q. Zhang , B. Lake
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M. Mihalik Jr. R. I. Bewley R. S. Eccleston J. Akimitsu E. Dagotto C. D. Batista G. Alvarez S. Johnston D. A. Tennant
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classification cond-mat.str-el cond-mat.supr-con
keywords dynamicsmagneticcuprateholesladderpairingresultsspin
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We investigate the spin dynamics of the cuprate ladder Sr$_{2.5}$Ca$_{11.5}$Cu$_{24}$O$_{41}$ 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 ($d$-wave) charge pairing process. Considering the parallels between ladders and two-dimensional cuprates, these results are potentially relevant for square lattices as well.

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Cited by 4 Pith papers

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  4. Towards effective models for low-dimensional cuprates: From ground state Hamiltonian reconstruction to spectral functions

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