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Interaction of magnetic field and magnetic history in high-temperature superconductors
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10.1063/1.2785959
/content/aip/journal/jap/102/7/10.1063/1.2785959
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/7/10.1063/1.2785959
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Transport losses for different values of the background dc field. The loss curve of the virgin sample and the theoretical predictions by Norris are also shown.

Image of FIG. 2.
FIG. 2.

Measured characteristic for the Ni–W substrate.

Image of FIG. 3.
FIG. 3.

Losses in the Ni–W substrate as a function of the local field.

Image of FIG. 4.
FIG. 4.

Penetration distance from the substrate’s edge of the front of the region corresponding to local fields greater than as a function of the applied field. Above this value of the field, the losses tend to saturate.

Image of FIG. 5.
FIG. 5.

Losses of the tape decomposed to the “pure” losses in the superconductor (assumed to be the measured losses for a dc field of ) and losses in the substrate [computed by finite element method (FEM)]. The sum of the two contributions is very close to the curve of the virgin tape.

Image of FIG. 6.
FIG. 6.

Magnetic susceptibility of the substrate as a function of the applied field. A continuous fit of the data points has been used in FEM simulations as a constitutive relation for the substrate material.

Image of FIG. 7.
FIG. 7.

(Color online) Magnetic field profile for a dc applied field of in the presence of (a) superconductor only, (b) substrate only, and (c) both of them. In the third case, the field inside the substrate is much higher, about . Only the right half of the tape is shown.

Image of FIG. 8.
FIG. 8.

Transport losses with a dc field turned on and off. Once the field is turned off, it is necessary to run twice a current ramp-up to to erase the memory of the trapped flux and obtain the original loss curve of the virgin sample.

Image of FIG. 9.
FIG. 9.

(Color online) Calculated field distribution after removing the background dc field. Only the right half of the tape is shown.

Image of FIG. 10.
FIG. 10.

ZFC and FC measurements for a background dc field of .

Image of FIG. 11.
FIG. 11.

Losses obtained with different current ramps after removing a background dc field of (ZFC).

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/content/aip/journal/jap/102/7/10.1063/1.2785959
2007-10-12
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Interaction of magnetic field and magnetic history in high-temperature superconductors
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/7/10.1063/1.2785959
10.1063/1.2785959
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