Berezinskii-Kosterlitz-Thouless to BCS-like superconducting transition crossover driven by weak magnetic fields in ultra-thin NbN films
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909258621124608 |
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| author | Sharma, Meenakshi Caprara, Sergio Perali, Andrea Singh, Surinder P. Singh, Sandeep Fretto, Matteo De Leo, Natascia Pinto, Nicola |
| author_facet | Sharma, Meenakshi Caprara, Sergio Perali, Andrea Singh, Surinder P. Singh, Sandeep Fretto, Matteo De Leo, Natascia Pinto, Nicola |
| contents | The Berezinskii-Kosterlitz-Thouless (BKT) transition in ultra-thin NbN films is investigated in the presence of weak perpendicular magnetic fields. A jump in the phase stiffness at the BKT transition is detected up to 5 G, while the BKT features are smeared between 5 G and 50 G, disappearing altogether at 100 G, where conventional current-voltage behaviour is observed. Our findings demonstrate that weak magnetic fields, insignificant in bulk systems, deeply affect our ultra-thin system, promoting a crossover from Halperin-Nelson fluctuations to a BCS-like state with Ginzburg-Landau fluctuations, as the field increases. This behavior is related to field-induced free vortices that screen the vortex-antivortex interaction and smear the BKT transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_11685 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Berezinskii-Kosterlitz-Thouless to BCS-like superconducting transition crossover driven by weak magnetic fields in ultra-thin NbN films Sharma, Meenakshi Caprara, Sergio Perali, Andrea Singh, Surinder P. Singh, Sandeep Fretto, Matteo De Leo, Natascia Pinto, Nicola Superconductivity Mesoscale and Nanoscale Physics Statistical Mechanics The Berezinskii-Kosterlitz-Thouless (BKT) transition in ultra-thin NbN films is investigated in the presence of weak perpendicular magnetic fields. A jump in the phase stiffness at the BKT transition is detected up to 5 G, while the BKT features are smeared between 5 G and 50 G, disappearing altogether at 100 G, where conventional current-voltage behaviour is observed. Our findings demonstrate that weak magnetic fields, insignificant in bulk systems, deeply affect our ultra-thin system, promoting a crossover from Halperin-Nelson fluctuations to a BCS-like state with Ginzburg-Landau fluctuations, as the field increases. This behavior is related to field-induced free vortices that screen the vortex-antivortex interaction and smear the BKT transition. |
| title | Berezinskii-Kosterlitz-Thouless to BCS-like superconducting transition crossover driven by weak magnetic fields in ultra-thin NbN films |
| topic | Superconductivity Mesoscale and Nanoscale Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2403.11685 |