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The influence of spontaneous and field-induced spin reorientation transitions on the magnetocaloric properties of HoZn and ErZn
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10.1063/1.3554725
/content/aip/journal/jap/109/6/10.1063/1.3554725
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/6/10.1063/1.3554725

Figures

Image of FIG. 1.
FIG. 1.

Specific heat of HoZn vs temperature calculated (solid line) at null field. The spontaneous spin reorientation transition (SRT) at T 1=23 K is indicated by the arrow. The dotted line represents calculations considering only exchange and crystal field contributions. Open circles represent experimental data (Ref. 21).

Image of FIG. 2.
FIG. 2.

Magnetization of HoZn vs μ 0 H calculated in the directions (solid line), (dashed line), and (dotted line). The symbols represent experimental data (Ref. 23).

Image of FIG. 3.
FIG. 3.

Mean values of the second-order operators (solid line), Pxy (dashed line), and Pyz  = Pzx (dotted line), calculated as a function of temperature at zero field. The average is null and therefore it is not shown.

Image of FIG. 4.
FIG. 4.

(Color online) Magnetization (upper panel) and second-order operator averages (lower panel) vs T calculated for several magnetic fields. (a), (b) Fields of 1 and 3 T were applied in the direction. (c), (d) Fields of 2 and 9 T were applied along the direction. (e), (d) The calculations were performed for µ 0 H =0.3 and =2 T in the direction.

Image of FIG. 5.
FIG. 5.

Spin reorientation diagram for HoZn. The magnetic field was applied (a) in the direction, (b) along the direction, and (c) in the one. The lines connecting the symbols are guides for the eyes.

Image of FIG. 6.
FIG. 6.

(Color online) (a) Isothermal entropy change and (b) adiabatic temperature change of HoZn calculated under magnetic field variations from 0 to 2 T in the , , and direction. The arrows indicate the spin reorientations observed.

Image of FIG. 7.
FIG. 7.

(Color online) Dependence of −ΔST with μ 0ΔH at the several spin reorientations temperatures and at TC , calculated in the (a) , (b) , and (c) directions.

Image of FIG. 8.
FIG. 8.

Spin reorientation diagram for ErZn. The magnetic fields were applied (a) in the direction and (b) along the direction. The lines are guides for the eyes.

Image of FIG. 9.
FIG. 9.

(Color online) (a) −ΔST and (b) ΔTS of ErZn calculated under several magnetic fields in the (solid lines), (dashed lines), and direction (dotted line).

Tables

Generic image for table
Table I.

Comparison of the magnetocaloric properties of some rare-earth-based intermetallic compounds.

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/content/aip/journal/jap/109/6/10.1063/1.3554725
2011-03-17
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The influence of spontaneous and field-induced spin reorientation transitions on the magnetocaloric properties of HoZn and ErZn
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/6/10.1063/1.3554725
10.1063/1.3554725
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