MgB<SUB>2</SUB>の磁化緩和

• 池田 博

  筑波大学物質工学系 筑波大学低温センター

• 古谷野 有

  筑波大学物質工学系 筑波大学低温センター

• 有馬 孝尚

  筑波大学物質工学系

• 吉川 孝三

  三菱重工業株式会社高砂研究所

• 吉崎 亮造

  筑波大学物質工学系 筑波大学低温センター

書誌事項

タイトル別名

• Magnetic Relaxation of MgB<SUB>2</SUB>
• MgB2の磁化緩和
• MgB2 ノ ジカ カンワ

抄録

We have investigated the transport and magnetic properties of the recently discovered superconducting MgB₂. We obtained irreversibility temperature Tr(H) and irreversibility field Hr(T) from magnetic measurement and irreversibility field B_c2 from resistivity measurement. The irreversibility temperature Tr(H), was determined from the merging temperature of the magnetic moment observed in the zero field cooling (ZFC) process in to the one in field cooling (FC) process. We define the transport irreversibility line from the temperature at zero-resistivity in the presence of magnetic field. We also measured the magnetic relaxation of the remanent. The sample was cooled in zero field and the field above H^*, where the flux front penetrated at the center of the sample. The time decay of the remanent moment was measured for about 10⁵ s. The relaxation of the remanent moment showed the linear ln (t) dependence in the whole observed temperature range. Those results of the irreversibility lines are plotted in H-T plane. The magnetic irreversibility lines are consistent with each other, while the transport one locates at the higher temperature side.

収録刊行物

• 日本金属学会誌

  日本金属学会誌 66 (4), 334-338, 2002

  公益社団法人 日本金属学会

キーワード

• irreversibility line
• residual resistance ratio
• MgB<SUB>2</SUB>
• magnetic relaxation

詳細情報

• CRID: 1390282681468754688
• NII論文ID: 130007342476
• NII論文ID: 10008832631
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet1952.66.4_334
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 6151599
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6151599
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet1952/66/4/66_4_334/_pdf
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