Journal Article Epitaxial growth of hexagonal tungsten bronze Cs<sub>x</sub>WO<sub>3</sub> films in superconducting phase region exceeding bulk limit

相馬, 拓人  ,  Soma, Takuto  ,  吉松, 公平  ,  Yoshimatsu, Kohei  ,  大友, 明  ,  Ohtomo, Akira

9 ( 7 )  , p.075801 , 2016-06 , IOP publishing
We report epitaxial synthesis of superconducting Cs x WO3 (x = 0.11, 0.20, and 0.31) films on Y-stabilized ZrO2 (111) substrates. The hexagonal crystal structure was verified not only for the composition within the stable region of the bulk (x = 0.20 and 0.31), but also for the out-of-range composition (x = 0.11). The onset of the superconducting transition was recorded at 5.8 K for x = 0.11. We found a strong correlation between the superconducting transition temperature (T C) and the c-axis length, irrespective of the Cs content. These results indicated that the hidden superconducting phase region of hexagonal tungsten bronze is accessible using epitaxial synthesis of lightly doped films.

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