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Boundaries of the critical state stability in a hard superconductor Nb3Al in the H–T plane
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View: Figures


Image of FIG. 1.
FIG. 1.

A distribution of the induction B and the molar heat capacity C inside the superconductor Nb3Al.

Image of FIG. 2.
FIG. 2.

A temperature dependence of the heat capacity in Nb3Al in the range of external magnetic fields 0–9 T; in more detail this dependence in the superconducting transition region is shown in the inset at the top (a); the fit of the formula (2) to the low-temperature heat capacity C(T) for two values of the field H = 0 and 9 T (b).

Image of FIG. 3.
FIG. 3.

A dependence of C(T)/T on T 2. The solid line shows the experimental results, the dashed line shows the line, calculated by the method of least squares for a normal metal.

Image of FIG. 4.
FIG. 4.

A dependence of the parameter а (a) and the width of the energy gap Δ (b) on an external magnetic field for Nb3Al.

Image of FIG. 5.
FIG. 5.

Hysteresis loops of magnetization M for different temperatures, measured by a vibration magnetometer (a); a dependence of the critical current density jc on an external magnetic field at different temperatures (b).

Image of FIG. 6.
FIG. 6.

The calculated loops of magnetization M and magnetostriction ΔL/L 0 for Nb3Al at various temperatures.

Image of FIG. 7.
FIG. 7.

Loops of magnetization (a), (b) and magnetostriction (c), (d) for Nb3Al: (a) and (c)—experiment, (b) and (d)—calculation.

Image of FIG. 8.
FIG. 8.

The H–T instability diagrams (calculation) for plates of Nb3Al with different thickness: in the ZFC regime, there are also characteristic temperature dependences of the magnetic field of the first magnetization jump H 1 fj , the quench field Hq , the field of the complete penetration Hp and the second critical field Hc 2 (a); with taking into account a magnetic prehistory, the symbols (★) in the three quadrants indicate magnetic fields at which avalanches of flow are observed in the experiment; (◐) is the instability boundary for a plate of the thickness of 4 mm (calculation) (b).

Image of FIG. 9.
FIG. 9.

A dependence of the maximum diameter dmax for a sample of Nb3Al, resistant to avalanches, on temperature in the case of zero field cooling and in the conditions of magnetization reversal by a field of the opposite direction.

Image of FIG. 10.
FIG. 10.

The H–T diagram of instability with and without taking into account a field dependence of the heat capacity and the critical current density.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Boundaries of the critical state stability in a hard superconductor Nb3Al in the H–T plane