抄録
Volume pinning forces are determined for a variety of bulk high-Tc superconductors of the 123 type from magnetization measurements. By means of scaling of the pinning forces, the acting pinning mechanisms in various temperature ranges can be identified. The Nd-based superconductors and some YBCO crystals exhibit a dominating pinning of the δTc type (i.e. small, superconducting pinning sites). This is ascribed to the presence of an Nd-rich phase with weaker superconducting properties, leading to a spatial scatter of Tc, which can also be provided by oxygen vacancy clusters. In contrast to this, the addition of insulating 211 particles provides pinning of the δl type. Measurements of the field-cooled magnetization show that the Nd-based superconductors exhibit two-step transitions if cooled/warmed in fields above 4 T. This secondary transition can be correlated to the peak effect. This suggests that the peak effect is an unique property of the superconducting matrix (i.e. oxygen vacancy clusters), whereas the 211 particles provide effective pinning in the entire temperature range acting as a quasi-'background' pinning mechanism for the peak effect. Based on these observations we construct a pinning force diagram for bulk high-Tc superconductors.
| 元の言語 | English |
|---|---|
| ページ（範囲） | 738-744 |
| ページ数 | 7 |
| ジャーナル | Superconductor Science and Technology |
| 巻 | 13 |
| 発行部数 | 6 |
| DOI | |
| 出版物ステータス | Published - 2000 6 |
| 外部発表 | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics
これを引用
Pinning mechanisms in bulk high-Tc superconductors. / Koblischka, Michael Rudolf; Murakami, Masato.
：: Superconductor Science and Technology, 巻 13, 番号 6, 06.2000, p. 738-744.研究成果: Article
}
TY - JOUR
T1 - Pinning mechanisms in bulk high-Tc superconductors
AU - Koblischka, Michael Rudolf
AU - Murakami, Masato
PY - 2000/6
Y1 - 2000/6
N2 - Volume pinning forces are determined for a variety of bulk high-Tc superconductors of the 123 type from magnetization measurements. By means of scaling of the pinning forces, the acting pinning mechanisms in various temperature ranges can be identified. The Nd-based superconductors and some YBCO crystals exhibit a dominating pinning of the δTc type (i.e. small, superconducting pinning sites). This is ascribed to the presence of an Nd-rich phase with weaker superconducting properties, leading to a spatial scatter of Tc, which can also be provided by oxygen vacancy clusters. In contrast to this, the addition of insulating 211 particles provides pinning of the δl type. Measurements of the field-cooled magnetization show that the Nd-based superconductors exhibit two-step transitions if cooled/warmed in fields above 4 T. This secondary transition can be correlated to the peak effect. This suggests that the peak effect is an unique property of the superconducting matrix (i.e. oxygen vacancy clusters), whereas the 211 particles provide effective pinning in the entire temperature range acting as a quasi-'background' pinning mechanism for the peak effect. Based on these observations we construct a pinning force diagram for bulk high-Tc superconductors.
AB - Volume pinning forces are determined for a variety of bulk high-Tc superconductors of the 123 type from magnetization measurements. By means of scaling of the pinning forces, the acting pinning mechanisms in various temperature ranges can be identified. The Nd-based superconductors and some YBCO crystals exhibit a dominating pinning of the δTc type (i.e. small, superconducting pinning sites). This is ascribed to the presence of an Nd-rich phase with weaker superconducting properties, leading to a spatial scatter of Tc, which can also be provided by oxygen vacancy clusters. In contrast to this, the addition of insulating 211 particles provides pinning of the δl type. Measurements of the field-cooled magnetization show that the Nd-based superconductors exhibit two-step transitions if cooled/warmed in fields above 4 T. This secondary transition can be correlated to the peak effect. This suggests that the peak effect is an unique property of the superconducting matrix (i.e. oxygen vacancy clusters), whereas the 211 particles provide effective pinning in the entire temperature range acting as a quasi-'background' pinning mechanism for the peak effect. Based on these observations we construct a pinning force diagram for bulk high-Tc superconductors.
UR - http://www.scopus.com/inward/record.url?scp=0033706107&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033706107&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/13/6/321
DO - 10.1088/0953-2048/13/6/321
M3 - Article
AN - SCOPUS:0033706107
VL - 13
SP - 738
EP - 744
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 6
ER -