"Freestanding crystalline YBa2Cu3O7−x heterostructure membranes"

Zhuoyu Chen: Bai Yang Wang, Berit H. Goodge, Di Lu, Seung Sae Hong, Danfeng Li, Lena F. Kourkoutis, Yasuyuki Hikita, and Harold Y. Hwang; Physical Review Materials, 06/24/19.

Additional Authors: Bai Yang Wang, Berit H. Goodge, Di Lu, Seung Sae Hong, Danfeng Li, Lena F. Kourkoutis, Yasuyuki Hikita, and Harold Y. Hwang

Abstract:

We report the synthesis of millimeter-sized freestanding single-crystal YBa2Cu3O7−x heterostructure membranes with nanoscale thickness. On a SrTiO3 substrate, a heteroepitaxial water-soluble sacrificial layer of Sr3Al2O6 followed by an encapsulated YBa2Cu3O7−x film is grown by pulsed laser deposition. A freestanding YBa2Cu3O7−x heterostructure membrane is obtained by etching the sacrificial layer. Its high crystalline quality is demonstrated via x-ray diffraction, electrical measurements, and scanning transmission electron microscopy.