[16p-D221-1~11] 11.2 Thin and thick superconducting films, coated conductors and film crystal growth

▲ [16p-D221-1] Observation of superconducting transition in MTO/STO heteroepitaxial multilayer films

〇Alok Kumar Jha¹, Kaname Matsumoto¹, Sota Fujimoto¹, Tomoya Horide¹, Masaki Mito¹, Ataru Ichinose² (1.Kyushu Instt. Tech., 2.CRIEPI)

Keywords:Superconductor, Thin film, Novel material

In the present study, the multilayer structures of spinel-type oxides containing transition metals are investigated. We studied the electrical transport properties of spinel MgTi₂O₄/SrTiO₃ multilayer thin films with varying layer thickness and observed the appearance of superconducting transition with varying onset temperatures depending upon the layer thickness. In one of the multilayer films, the onset of superconducting transition temperature is as high as 50 K which is also confirmed from the ac magnetization measurement. The superconductivity in these multilayer films is attributed to the phase transition in these multilayer thin films which is suppressed by the epitaxial strain induced and transferred from one layer to another.