TY - JOUR
T1 - Relationship between surface resistance and critical current density of HTS thin films in a dc magnetic field
AU - Saito, A.
AU - Shirakawa, M.
AU - Kitamura, K.
AU - Noguchi, Y.
AU - Mukaida, M.
AU - Yamasaki, H.
AU - Nakagawa, Y.
AU - Ohshima, S.
N1 - Funding Information:
Manuscript received October 4, 2004. This research was supported in part by CREST of Japan Science and Technology corporation, Yamagata prefecture, Marubun research promotion foundation, the Ministry of Education, Culture, Sports, Science and technology, Grant-in-Aid for Young Scientists (B), 16760019, 2004. A part of this work was carried out in the clean room of Yamagata University.
PY - 2005/6
Y1 - 2005/6
N2 - We investigated the relationship between the surface resistance (R s) and critical current density (Jc) of DyBa 2Cu3O7-δ (DyBCO) thin films in a dc magnetic field. The Rs of DyBCO films at 21.8 GHz was measured using a dielectric resonator method and the Jc was determined by magnetic measurement and Bean's model. A dc magnetic field of up to 5 T was applied along the c-axis of the films. The relationship between the Rs and J c of DyBCO thin films under a zero magnetic field was explained by the following equation, Rs = α × 107/J c, where a is a constant of 1.2, and the units of the Rs and Jc are ohm and A/m2, respectively. In addition, the Rs in dc magnetic fields up to 5 T were inversely proportional to the Jc. However, the parameter a, which was fitted from the R s - Jc characteristics in each magnetic field, increased slightly with an increase the magnitude of the applied field. These results indicate that the relationship between the Rs and Jc in a zero magnetic field may be a general property of HTS thin films and that the α in DyBCO thin films depends on the magnitude of the applied magnetic field.
AB - We investigated the relationship between the surface resistance (R s) and critical current density (Jc) of DyBa 2Cu3O7-δ (DyBCO) thin films in a dc magnetic field. The Rs of DyBCO films at 21.8 GHz was measured using a dielectric resonator method and the Jc was determined by magnetic measurement and Bean's model. A dc magnetic field of up to 5 T was applied along the c-axis of the films. The relationship between the Rs and J c of DyBCO thin films under a zero magnetic field was explained by the following equation, Rs = α × 107/J c, where a is a constant of 1.2, and the units of the Rs and Jc are ohm and A/m2, respectively. In addition, the Rs in dc magnetic fields up to 5 T were inversely proportional to the Jc. However, the parameter a, which was fitted from the R s - Jc characteristics in each magnetic field, increased slightly with an increase the magnitude of the applied field. These results indicate that the relationship between the Rs and Jc in a zero magnetic field may be a general property of HTS thin films and that the α in DyBCO thin films depends on the magnitude of the applied magnetic field.
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U2 - 10.1109/TASC.2005.849397
DO - 10.1109/TASC.2005.849397
M3 - Article
AN - SCOPUS:22144457572
SN - 1051-8223
VL - 15
SP - 3696
EP - 3699
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2 PART III
ER -