Experimental and theoretical studies of d-dot

Takekazu Ishida, Masaki Fujii, Taiji Abe, Masuo Yamamoto, Shigehito Miki, Shuichi Kawamata, Kazuo Satoh, Tsutomu Yotsuya, Masaru Kato, Masahiko Machida, Tomio Koyama, Takahito Terashima, Shigeki Tsukui, Motoaki Adachi

研究成果: Article

6 引用 (Scopus)


We propose the idea of d-dot, where a d-wave superconducting dot is embedded in s-wave matrix. Spontaneous half vortices should appear in the four corners of the d-dot [M. Kato, M. Ako, M. Machida, T. Koyama, T. Ishida, Physica C 412-414 (2004) 352; M. Ako, M. Kato, M. Machida, T. Koyama, T. Ishida, Physica C 412-414 (2004) 544; M. Fujii, T. Abe, H. Yoshikawa, S. Miki, S. Kawamata, K. Satoh, T. Yotsuya, M. Kato, M. Machida, T. Koyama, T. Terashima, S. Tsukui, M. Adachi, T. Ishida, Physica C 426-431 (2005) 104]. Symmetric geometry and the fourfold symmetry of the d-dot would be suitable as a building block for constructing the novel physical systems. The phase dynamics of a closed 0-π junction, which can be realized in a small dx2 - y2-dot, is mapped on a quantum two-level system when the system size is small enough. Using two-component Ginzburg-Landau equation, we study the physical properties of d-dots systematically. We prepare epitaxial YBa2Cu3O7 (YBCO) films of thickness 100 nm on SrTiO3 substrates using a laser ablation apparatus. The d-dot is fabricated by a photolithography, electron beam lithography EB and an electron cyclotron resonance (ECR) etching, a focused ion beam microscope, and a lift-off technique. Local vortex profile is investigated using a SQUID microscope when d-dot is cooled in zero field.

ジャーナルPhysica C: Superconductivity and its applications
発行部数SPEC. ISS.
出版物ステータスPublished - 2006 5 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Ishida, T., Fujii, M., Abe, T., Yamamoto, M., Miki, S., Kawamata, S., Satoh, K., Yotsuya, T., Kato, M., Machida, M., Koyama, T., Terashima, T., Tsukui, S., & Adachi, M. (2006). Experimental and theoretical studies of d-dot. Physica C: Superconductivity and its applications, 437-438(SPEC. ISS.), 104-110. https://doi.org/10.1016/j.physc.2006.03.013