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  Terahertz phase slips in striped La2−xBaxCuO4

Fu, D., Nicoletti, D., Fechner, M., Buzzi, M., Gu, G. D., & Cavalleri, A. (2021). Terahertz phase slips in striped La2−xBaxCuO4.

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2109.08070.pdf (Preprint), 5MB
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2109.08070.pdf
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https://arxiv.org/abs/2109.08070 (Preprint)
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 Creators:
Fu, D.1, Author              
Nicoletti, D.1, Author              
Fechner, M.1, Author              
Buzzi, M.1, Author              
Gu, G. D.2, Author
Cavalleri, A.1, 3, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, ou_persistent22              
3Department of Physics, Clarendon Laboratory, University of Oxford, ou_persistent22              

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Free keywords: Condensed Matter, Superconductivity, cond-mat.supr-con, Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el
 Abstract: Interlayer transport in high-TC cuprates is mediated by superconducting tunneling across the CuO2 planes. For this reason, the terahertz frequency optical response is dominated by one or more Josephson plasma resonances and becomes highly nonlinear at fields for which the tunneling supercurrents approach their critical value, IC. These large terahertz nonlinearities are in fact a hallmark of superconducting transport. Surprisingly, however, they have been documented in La2−xBaxCuO4 also above TC for doping values near x=1/8, and interpreted as an indication of superfluidity in the stripe phase. Here, Electric Field Induced Second Harmonic (EFISH) is used to study the dynamics of time-dependent interlayer voltages when La2−xBaxCuO4 is driven with large-amplitude terahertz pulses, in search of other characteristic signatures of Josephson tunnelling in the normal state. We show that this method is sensitive to the voltage anomalies associated with 2π Josephson phase slips, which near x=1/8 are observed both below and above TC. These results document a new regime of nonlinear transport that shares features of sliding charge-density-waves and superconducting phase dynamics.

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Language(s): eng - English
 Dates: 2021-09-16
 Publication Status: Published online
 Pages: 26
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2109.08070
 Degree: -

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