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Observations of a hysteresis loss valley in yttrium barium copper oxide superconductors
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10.1063/1.2357840
/content/aip/journal/jap/100/7/10.1063/1.2357840
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/7/10.1063/1.2357840
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a), (b), and (c) display our measurements for samples A, B, and C of the imaginary ac susceptibility vs temperature for applied ac field amplitudes ranging from at a frequency in the presence of a collinear static bias field .

Image of FIG. 2.
FIG. 2.

(a), (b), and (c) display our measurements for samples A, B, and C, of the imaginary ac susceptibility vs temperature for applied ac field amplitudes ranging from at a frequency in the presence of a collinear static bias field .

Image of FIG. 3.
FIG. 3.

, the experimental peak values of displayed in Fig. 1 where , vs , the corresponding applied ac fields, in (a) and in (b), vs the corresponding temperatures where the observed peaks are situated.

Image of FIG. 4.
FIG. 4.

, the experimental peak values of displayed in Fig. 1 where , vs , the corresponding applied ac fields, in (a) and in (b), vs the corresponding temperatures where the observed peaks are situated.

Image of FIG. 5.
FIG. 5.

The open circles display the observed relationship between the applied ac fields and the temperatures where the peaks occur in the imaginary part of the susceptibility measured in the absence of a bias field . The solid curve displays the dependence on temperature of the full penetration field introduced in our modeling of the hysteresis losses using the parameters given in the legend. The right hand scale gives , where is for the sample studied.

Image of FIG. 6.
FIG. 6.

(a) displays again the measurements presented in Fig. 1(a) with the temperature now normalized to , the estimated critical temperature for the intergranular network (the “matrix”), for ease of comparison with the theoretical curves shown in (b), which displays the curves calculated with our model exploiting idealized cylinder geometry with , , and . The solid symbols identify the curves where the lowest observed and the lowest calculated peak are encountered.

Image of FIG. 7.
FIG. 7.

(a) displays vs , the peak experimental values of presented in Fig. 1(a), and in (b), vs , the temperatures where the observed peaks are situated. The solid lines trace , the peak values of , the normalized hysteresis losses generated by our model vs in (a) and in (b).

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/content/aip/journal/jap/100/7/10.1063/1.2357840
2006-10-13
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observations of a hysteresis loss valley in yttrium barium copper oxide superconductors
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/7/10.1063/1.2357840
10.1063/1.2357840
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