YA-PING CHIU2021-07-282021-07-28201918844049https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076183597&doi=10.1038%2fs41427-019-0178-y&partnerID=40&md5=84e0cfad32e52765acd73414406b1eechttps://scholars.lib.ntu.edu.tw/handle/123456789/575010The competition between order parameters, such as ferroelectricity, ferromagnetism, and superconductivity, is one of the most fascinating topics in condensed matter physics. Here, we report intriguing anisotropic superconductivity in YBa2Cu3O7 ? x films induced by a multiferroic, BiFeO3, with periodic domain patterns. The anisotropic superconductivity was investigated by transport measurements and supported by phase-field simulations, and then the detailed local electronic structures were revealed by cross-sectional scanning tunneling microscopy. We found that the oxygen redistribution in YBa2Cu3O7 ? x modulated by the ferroelectric polarization in BiFeO3 was the key mechanism driving this anisotropic superconductivity. The presented heteroarchitecture of a high-temperature superconductor and a domain-engineered multiferroic provides a new approach to tune superconductivity and offers potential advantages for the design of future multifunctional devices. ? 2019, The Author(s).Anisotropy; Barium compounds; Bismuth compounds; Copper compounds; Electronic structure; Ferroelectricity; Iron compounds; Scanning tunneling microscopy; Yttrium barium copper oxides; Anisotropic superconductivity; Cross-sectional scanning tunneling microscopies; Ferroelectric polarization; Local electronic structures; Multifunctional devices; Periodic domains; Phase-field simulation; Transport measurements; Iron-based Superconductorsjournal article10.1038/s41427-019-0178-y2-s2.0-85076183597