Josephson coupling in Lanthanum-based cuprates superlattices
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arXiv
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| Format: | Preprint |
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2025
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| author | Ahmad, Halima Giovanna Massarotti, Davide Tafuri, Francesco Logvenov, Gennady Bianconi, Antonio Campi, Gaetano |
| author_facet | Ahmad, Halima Giovanna Massarotti, Davide Tafuri, Francesco Logvenov, Gennady Bianconi, Antonio Campi, Gaetano |
| contents | In most anisotropic compounds such as bismuth-based layered cuprate perovskites, the supercurrent across the blocking layer is of Josephson type, and a single crystal forms a natural stack of Josephson junctions. Here, we report on the evidence of Josephson-like transport in an artificial cuprate superlattice composed of 10 LaSrCuO-LaCuO repeats, creating a superlattice of junctions, where LCO is a superconducting Mott insulator and LSCO an overdoped metal, respectively. The superlattice has been designed with a long period d = L+W = 5.28 nm, with L and W the thickness of LCO and LSCO units, respectively, and is in the underdoped regime with an average doping level < δ >= 0.11. Quantum-size effects and Rashba spin-orbit coupling are controlled by L/d = 0.75, with a quasi-2D superconducting transition temperature of 41 K and a c-axis coherence length of about 1.5 nm. Measurements at very low temperatures show evidence of Josephson phase dynamics consistent with very low Josephson coupling and a phase diffusion regime, thus explaining why Josephson coupling in LSCO superlattices has been so elusive. The tuning of LSCO superlattices in the Josephson regime enriches the phase diagram of HTS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04231 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Josephson coupling in Lanthanum-based cuprates superlattices Ahmad, Halima Giovanna Massarotti, Davide Tafuri, Francesco Logvenov, Gennady Bianconi, Antonio Campi, Gaetano Superconductivity In most anisotropic compounds such as bismuth-based layered cuprate perovskites, the supercurrent across the blocking layer is of Josephson type, and a single crystal forms a natural stack of Josephson junctions. Here, we report on the evidence of Josephson-like transport in an artificial cuprate superlattice composed of 10 LaSrCuO-LaCuO repeats, creating a superlattice of junctions, where LCO is a superconducting Mott insulator and LSCO an overdoped metal, respectively. The superlattice has been designed with a long period d = L+W = 5.28 nm, with L and W the thickness of LCO and LSCO units, respectively, and is in the underdoped regime with an average doping level < δ >= 0.11. Quantum-size effects and Rashba spin-orbit coupling are controlled by L/d = 0.75, with a quasi-2D superconducting transition temperature of 41 K and a c-axis coherence length of about 1.5 nm. Measurements at very low temperatures show evidence of Josephson phase dynamics consistent with very low Josephson coupling and a phase diffusion regime, thus explaining why Josephson coupling in LSCO superlattices has been so elusive. The tuning of LSCO superlattices in the Josephson regime enriches the phase diagram of HTS. |
| title | Josephson coupling in Lanthanum-based cuprates superlattices |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2502.04231 |