Terahertz phase slips in striped La2−xBaxCuO4
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 app...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2022
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| _version_ | 1826310526431395840 |
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| author | Fu, D Nicoletti, D Fechner, M Buzzi, M Gu, GD Cavalleri, A |
| author_facet | Fu, D Nicoletti, D Fechner, M Buzzi, M Gu, GD Cavalleri, A |
| author_sort | Fu, D |
| collection | OXFORD |
| description | 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 2πJosephson phase slips, which near x=1/8 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. |
| first_indexed | 2024-03-07T07:53:18Z |
| format | Journal article |
| id | oxford-uuid:9cff2d54-9673-45ae-aa00-ff1e6592027a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:53:18Z |
| publishDate | 2022 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:9cff2d54-9673-45ae-aa00-ff1e6592027a2023-07-27T08:47:16ZTerahertz phase slips in striped La2−xBaxCuO4Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9cff2d54-9673-45ae-aa00-ff1e6592027aEnglishSymplectic ElementsAmerican Physical Society2022Fu, DNicoletti, DFechner, MBuzzi, MGu, GDCavalleri, AInterlayer 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 2πJosephson phase slips, which near x=1/8 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. |
| spellingShingle | Fu, D Nicoletti, D Fechner, M Buzzi, M Gu, GD Cavalleri, A Terahertz phase slips in striped La2−xBaxCuO4 |
| title | Terahertz phase slips in striped La2−xBaxCuO4 |
| title_full | Terahertz phase slips in striped La2−xBaxCuO4 |
| title_fullStr | Terahertz phase slips in striped La2−xBaxCuO4 |
| title_full_unstemmed | Terahertz phase slips in striped La2−xBaxCuO4 |
| title_short | Terahertz phase slips in striped La2−xBaxCuO4 |
| title_sort | terahertz phase slips in striped la2 xbaxcuo4 |
| work_keys_str_mv | AT fud terahertzphaseslipsinstripedla2xbaxcuo4 AT nicolettid terahertzphaseslipsinstripedla2xbaxcuo4 AT fechnerm terahertzphaseslipsinstripedla2xbaxcuo4 AT buzzim terahertzphaseslipsinstripedla2xbaxcuo4 AT gugd terahertzphaseslipsinstripedla2xbaxcuo4 AT cavalleria terahertzphaseslipsinstripedla2xbaxcuo4 |