Magnetic characterization of bulk C-Added MgB2

Michael R. Koblischka, Anjela Koblischka-Veneva, Muralidhar Miryala, Masato Murakami

研究成果: Article査読

3 被引用数 (Scopus)


To find a cheap and efficient way to produce high-performance bulk MgB2 superconductors, a series of samples produced with different contents of carbon-coated, nanometer-sized amorphous boron was prepared to improve the magnetic properties. A single-step solid-state reaction at the optimal reaction temperature of 805 °C for 3 h in pure argon atmosphere was used. Small pieces cut from the bulk were characterized by magnetic hysteresis loop measurements in magnetic fields up to ±7 T at temperatures ranging from 5 to 35 K using a physical property measurement system. Critical current densities and flux pinning forces were calculated from the magnetization data. The pinning force data of all samples were compared using the pinning force scaling approach by Eisterer. The peak positions h0 were found at h0 ∼ 0.33, indicating a dominant flux pinning at the grain boundaries for samples with 50% and 30% carbon-coated boron, while the scaling reveals a peak position of 0.44 for the 10% sample that indicates pinning at point defects.

ジャーナルIEEE Transactions on Applied Superconductivity
出版ステータスPublished - 2019 4月

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
  • 電子工学および電気工学


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