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Unusual magnetic properties in
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Image of FIG. 1.
FIG. 1.

Powder XRD patterns at room temperature for sintered (, 0.2, and 0.3) samples.

Image of FIG. 2.
FIG. 2.

ZFC-FC curves, obtained at 10 Oe, of the samples (a) and (b). Inset: detail of the ZFC curve of the sample.

Image of FIG. 3.
FIG. 3.

Real part and imaginary part of the ac susceptibility of the and 0.3 samples (measured with a frequency of 1 kHz and ac applied field of 1 Oe).

Image of FIG. 4.
FIG. 4.

Hysteresis loops, obtained at 5 K and cooled without applied field, of the (, 0.2, and 0.3) samples. The inset shows an enlargement of the loops at low fields.

Image of FIG. 5.
FIG. 5.

Hysteresis loops of the and samples at low temperature cooled under different applied fields. The loops were obtained at 5 K excepting the one for the sample, 30 kOe (at 2.5 K).

Image of FIG. 6.
FIG. 6.

Hysteresis loop of the sample at 5 K (left) and 65 K (right) after cooling under an applied field of 65 kOe, before (dashed line) and after (continuous line) subtracting a linear contribution from the loop. The low figures show detail, focusing on the hysteresis loops after subtracting the linear contribution.

Image of FIG. 7.
FIG. 7.

Evolution of the exchange bias, , and coercive field (detail) with the temperature after cooling down under an applied field of 65 kOe for the (circles), (squares), and (diamonds) samples.

Image of FIG. 8.
FIG. 8.

Hysteresis loops of the sample at 5 K cooled under 65 kOe from different temperatures.

Image of FIG. 9.
FIG. 9.

Thermoremanence of the sample after cooling under an applied field of 65 kOe from 100 and 25 K.

Image of FIG. 10.
FIG. 10.

Mössbauer spectra of (, 0.2, and 0.3) samples collected at 4.2 K.

Image of FIG. 11.
FIG. 11.

Mössbauer spectra of (, 0.2, and 0.3) samples collected at 293 K.


Generic image for table
Table I.

Nominal and analytical composition of the samples.

Generic image for table
Table II.

Lattice parameters of the samples. The values in brackets show the estimated error in the last significant number.

Generic image for table
Table III.

Hyperfine parameters, relative intensity , valence state, and Fe sites observed in Mössbauer spectra obtained at 4.2 and 293 K. The isomer shift and the quadrupole shift have been obtained from the initial fit, while the mean quadrupole splitting and the mean hyperfine field of the respective distributions have been obtained from the second refinement.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unusual magnetic properties in Pr1−xSrxFe0.8Ni0.2O3−δ (x≤0.3)