Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films
RIS ID
115195
Abstract
We prepared one-unit-cell (1-UC) thick FeSe films on insulating SrTiO3 substrates with non-superconducting FeTe protection layers by molecular beam epitaxy for ex situ studies. By direct transport and magnetic measurements, we provide definitive evidence for high temperature superconductivity in the 1-UC FeSe films with an onset 𝑇C above 40 K and an extremely large critical current density 𝐽C∼1.7×106 A/cm2 at 2 K, which are much higher than 𝑇C∼8 K and 𝐽C∼104 A/cm2 for bulk FeSe, respectively. Our work may pave the way to enhancing and tailoring superconductivity by interface engineering
Publication Details
Zhang, W., Sun, Y., Zhang, J., Li, F., Guo, M., Zhao, Y., Zhang, H., Peng, J., Xing, Y., Wang, H., Fujita, T., Hirata, A., Li, Z., Ding, H., Tang, C., Wang, M., Wang, Q., He, K., Ji, S., Chen, X., Wang, J., Xia, Z., Li, L., Wang, Y., Wang, J., Wang, L., Chen, M., Xue, Q. & Ma, X. (2014). Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films. Chinese Physics Letters, 31 (1), 017401-1-017401-5.