Anisotropic superconducting properties of MgB2 single crystals

Yu Eltsev, S. Lee, K. Nakao, N. Chikumoto, S. Tajima, N. Koshizuka, M. Murakami

研究成果: Article査読

21 被引用数 (Scopus)

抄録

In-plane electrical transport properties of MgB2 single crystals grown under a high pressure of 4-6 GPa and temperature of 1400-1700 °C in the Mg-B-N system have been measured. For all specimens we found a sharp superconducting transition around 38.1-38.3 K with ΔTc(10-90%) within 0.2-0.3 K. Estimated resistivity value at 40 K is about 1 μΩ cm and the resistivity ratio ρ(273 K)/ρ(40 K) = 4.9±0.3. Results of measurements in magnetic field up to 5.5 T perpendicular to Mg and B planes (H) and up to 9 T in parallel orientation (H) show temperature dependent anisotropy of the upper critical field with anisotropy ratio γ = Hc2∥/Hc2⊥ increasing from 2.2 close to Tc up to about 3 below 30 K. Strong deviation of the angular dependence of Hc2 from the anisotropic mass model has been also found.

本文言語English
ページ(範囲)61-64
ページ数4
ジャーナルPhysica C: Superconductivity and its applications
378-381
PART 1
DOI
出版ステータスPublished - 2002 10月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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