Terahertz phase slips in striped La 2 − x Ba x Cu O 4

Fu, D.; Nicoletti, D.; Fechner, M.; Buzzi, M.; Gu, G. D.; Cavalleri, A.

doi:10.1103/PhysRevB.105.L020502

Title: Terahertz phase slips in striped ${La}_{2 - x} {Ba}_{x} Cu O_{4}$

Journal Article · Tue Jan 18 00:00:00 EST 2022 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.105.L020502· OSTI ID:1840802

;

; Fechner, M.;

; Gu, G. D.; Cavalleri, A.

Interlayer transport in high-$$T_C$$ 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 $$I_C$$ . These large terahertz nonlinearities are in fact a hallmark of superconducting transport. Surprisingly, however, they have been documented in La_2-xBa_xCuO₄ (LBCO) also above $$T_C$$ for doping values near x =$$\frac{1}{8}$$ 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 = $$\frac{1}{8}$$ are observed both below and above $$T_C$$. These results document a regime of nonlinear transport that shares features of fluctuating stripes and superconducting phase dynamics.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; European Research Council (ERC); German Research Foundation (DFG); The Hamburg Centre for Ultrafast Imaging

Grant/Contract Number:: SC0012704; 319286; 194651731; 170620586

OSTI ID:: 1840802

Alternate ID(s):: OSTI ID: 1845424

Report Number(s):: BNL-222763-2022-JAAM; PRBMDO; L020502

Journal Information:: Physical Review B, Journal Name: Physical Review B Vol. 105 Journal Issue: 2; ISSN 2469-9950

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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