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Condensed Matter > Strongly Correlated Electrons

Title: Theory of a Strange Metal in a Quantum Superconductor to Metal Transition

Abstract: Recent experiments with nanopatterned thin films revealed an unusual quantum superconductor to metal phase transition (QSMT) with a linear in temperature resistivity. In contrast, most known examples of such transitions and standard theoretical considerations predict a temperature-independent sheet resistance of order $R_Q = \frac{\hbar}{e^2}$. We propose an effective theory of a disordered superconductor which features a QSMT with robust $T$ linear resistivity at the critical point. The crucial ingredient in our model is spatial disorder in the pairing interaction. Such random pairing mirrors the emergent phase disorder seen in a recent mean field study of a microscopic $d$-wave superconductor subject to potential disorder. We also make the prediction that in such systems the diamagnetic susceptibility diverges as $\log\frac{\Lambda}{T}$, which starkly differs from the power law divergence in standard XY transitions.
Comments: 10+8 pages, 7 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:2401.17353 [cond-mat.str-el]
  (or arXiv:2401.17353v2 [cond-mat.str-el] for this version)

Submission history

From: Jaewon Kim [view email]
[v1] Tue, 30 Jan 2024 19:00:00 GMT (826kb,D)
[v2] Fri, 5 Apr 2024 01:55:15 GMT (830kb,D)

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