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Magnetization decay in neutron irradiated bulk samples
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Image of FIG. 1.
FIG. 1.

Critical current densities as a function of magnetic fields at 5, 10, and 20 K for all samples we considered.

Image of FIG. 2.
FIG. 2.

Magnetization decay of the sample P1 at three different temperatures: for , the decay at 1.5, 3, and 4.5 T are shown; for , those at 1.5, 2.5, and 3.5 T; and for , those at 1, 2, and 3 T.

Image of FIG. 3.
FIG. 3.

Magnetization decay of three different samples (P0, P3, and P3.7) displayed at the same reduced temperature and at various applied magnetic fields.

Image of FIG. 4.
FIG. 4.

Noisy-clean transition from magnetization decay in the plane for the different samples. Due to the limited number of magnetization decay measurements done the passage from noisy to clean regime is indicated with a bar (whose amplitude corresponds to the field distance between the two measurements that marked the passage) and not with a line.

Image of FIG. 5.
FIG. 5.

Hysteresis loop measured at on sample P3.7. The inset shows an enlarged view of the region between and in which the instabilities are clearly observed.

Image of FIG. 6.
FIG. 6.

values as a function of the applied field at 10 K for all the samples. In the inset: as a function of the fluence (i.e., for the various samples) at and .

Image of FIG. 7.
FIG. 7.

Relaxation rate (left scale) and index (right scale) vs at for bulk and film samples.

Image of FIG. 8.
FIG. 8.

Critical current density measured on P3 sample at (upper panel) and (lower panel) both with the SQUID magnetometer and with the VSM.


Generic image for table
Table I.

Characteristics of the samples here considered: sample name, neutron fluence, resistivity in the normal state, critical temperature, transition width, and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetization decay in neutron irradiated MgB2 bulk samples