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      Articles written in Bulletin of Materials Science

    • Superconducting epitaxial YBa$_2$Cu$_3$O$_{7−\delta}$ on SrTiO$_3$-buffered Si(001)

      K AHMADI-MAJLAN H ZHANG X SHEN M J MOGHADAM M CHRYSLER P CONLIN R HENSLEY D SU J Y T WEI J H NGAI

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      Thin films of optimally doped(001)-oriented YBa$_2$Cu$_3$O$_{7−\delta}$ are epitaxially integrated on silicon(001) through growth on a single crystalline SrTiO$_3$ buffer. The former is grown using pulsed-laser deposition and the latter is grown on Si using oxide molecular beam epitaxy. The single crystal nature of the SrTiO$_3$ buffer enables high quality YBa$_2$Cu$_3$O$_{7−\delta}$ films exhibiting high transition temperatures to be integrated on Si. For a 30-nm thick SrTiO$_3$ buffer, 50-nm thick YBa$_2$Cu$_3$O$_{7−\delta}$ films that exhibit a transition temperature of $\sim$93 K, and a narrow transition width (<5 K) are achieved. The integration ofsingle crystalline YBa$_2$Cu$_3$O$_{7−\delta}$ on Si(001) paves the way for the potential exploration of cuprate materials in a variety of applications.

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