Abstract
It has been proposed by Müller and Shengelaya that underdoped ultrathin layers of copper-oxide high-temperature superconductors (HTSs) sandwiched between high-dielectric-constant insulator layers could manifest increased superconducting critical temperature T_c. To check this hypothesis, we investigated structural and transport properties of YBa_{2}Cu_{3}O_{7-delta } (YBCO) thin films sandwiched between SrTiO_{3} (STO) layers. Scanning transmission electron microscopy (STEM) showed that a high-quality interface is formed between YBCO and the top STO layers. An increase of T_c up to DeltaTapprox20 K was observed at these interfaces in case of underdoped YBCO films.
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