Fabrication of (Hg,Re)-1212 thin films on STO substrates with buffer layers

Abstract

(Hg 0.9Re 0.1)Ba 2CaCu 2O y ((Hg,Re)-1212) thin films were fabricated on buffered SrTiO 3 (STO) substrates. BaZrO 3, (LaAlO 3) 0.3–(SrAl 0.5Ta 0.5O 3) 0.7, CeO 2 and Y 0.9La 0.2Ba 1.9Cu 3O y (La-YBCO) were examined as buffer layer materials. The buffer layers were prepared on STO substrates by pulsed laser deposition or off-axis magnetron sputtering methods. (Hg,Re)-1212 thin films were fabricated on the buffered STO substrates by a two-step process. c-Axis oriented and in-plane aligned films were obtained on CeO 2 and La-YBCO buffer layers. The films had a smooth surface and exhibited T c above 115 K. The J c values at 77 K in a self-field were 4.4 × 10 6 and 9.1 × 10 6 A/cm 2 for the films on the CeO 2 and La-YBCO buffer layers, respectively.