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  Terahertz phase slips in striped La2−xBaxCuO4

Fu, D., Nicoletti, D., Fechner, M., Buzzi, M., Gu, G. D., & Cavalleri, A. (2022). Terahertz phase slips in striped La2−xBaxCuO4. Physical Review B, 105(2): L020502. doi:10.1103/PhysRevB.105.L020502.

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PhysRevB.105.L020502.pdf (Publisher version), 2MB
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
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Fu-PRB-2022-Suppl.pdf (Supplementary material), 3MB
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Supplemental Material: Simulation of the Josephson phase dynamics with the sine-Gordon equation, Experimental methods, Additional data sets
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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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 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 (LBCO) 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 is used to study the dynamics of time-dependent interlayer voltages when LBCO is driven with large-amplitude terahertz pulses, in search of other characteristic signatures of Josephson tunneling in the normal state. We show that this method is sensitive to the voltage anomalies associated with 2π Josephson phase slips, which near x=18 are observed both below and above TC. These results document a regime of nonlinear transport that shares features of fluctuating stripes and superconducting phase dynamics.

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Language(s): eng - English
 Dates: 2021-12-022021-09-162022-01-032022-01-182022-01-01
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: arXiv: 2109.08070
DOI: 10.1103/PhysRevB.105.L020502
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Grant ID : 319286
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)
Project name : We acknowledge support from the Deutsche Forschungsgemein- schaft via the excellence cluster The Hamburg Centre for Ul- trafast Imaging (EXC 1074—Project ID No. 194651731) and the priority program SFB925 (Project ID No. 170620586).
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 105 (2) Sequence Number: L020502 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008