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  Giant Dynamical Paramagnetism in the driven pseudogap phase of YBa2Cu3O6+x

Michael, M., De Santis, D., Demler, E. A., & Lee, P. A. (2024). Giant Dynamical Paramagnetism in the driven pseudogap phase of YBa2Cu3O6+x.

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2410.12919.pdf (Preprint), 11MB
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2410.12919.pdf
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File downloaded from arXiv at 2024-11-20
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https://arxiv.org/abs/2410.12919 (Preprint)
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 Creators:
Michael, M.1, Author           
De Santis, D.2, Author
Demler, E. A.3, Author
Lee, P. A.4, Author
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Physics and Chemistry Dept., Interdisciplinary Theoretical Physics Group, Palermo University, ou_persistent22              
3Institute for Theoretical Physics, ETH Zurich, ou_persistent22              
4Department of Physics, MIT, ou_persistent22              

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Free keywords: Condensed Matter, Superconductivity, cond-mat.supr-con, Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el,Nonlinear Sciences, Pattern Formation and Solitons, nlin.PS
 Abstract: In the past decade, photo-induced superconducting-like behaviors have been reported in a number of materials driven by intense pump fields. Of particular interest is the high-Tc cuprate YBa2Cu2O6+x, where such effect has been reported up to the so-called pseudogap temperature T∗∼300−400 K. In a recent tour-de-force experiment, a transient magnetic field which is proportional to and in the same direction of an applied field has been observed outside the sample, suggestive of flux exclusion due to the Meissner effect. In this paper, we point out that the transient magnetic field could be explained by a model of bilayers of copper-oxygen planes with a local superconducting phase variable persisting up to the pseudo-gap temperature at equilibrium. Under pumping, the time evolution is described by a driven sine-Gordon equation. In the presence of an external magnetic field, this model exhibits a novel instability which amplifies the current at the edges of the bilayer formed by defects or grain boundaries, producing a giant paramagnetic magnetization in the same direction as the applied field. We present how this scenario can fit most of the available data and propose additional experimental tests which can distinguish our proposal from the Meissner flux exclusion scenario. To the extent that this model can account for the data, we conclude that the experiments have the important consequence of revealing the presence of local pairing in the pseudogap phase. More broadly, this work provides a new mechanism for amplifying external magnetic fields at ultra-fast time scales.

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Language(s): eng - English
 Dates: 2024-10-16
 Publication Status: Published online
 Pages: 24
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2410.12919
 Degree: -

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