Artículo
Abstract:
The magnetocaloric effect is the isothermal change of magnetic entropy and the adiabatic temperature change induced in a magnetic material when an external magnetic field is applied. In this work, we present an experimental setup to study this effect in metamagnetic transitions, using the differential thermal analysis technique, which consists in measuring simultaneously the temperatures of the sample of interest and a reference one while an external magnetic field ramp is applied. We have tested our system to measure the magnetocaloric effect in La 0.305Pr 0.32Ca 0.375MnO 3, which presents phase separation effects at low temperatures (T<200 K). We obtain ΔT vs H curves, and analyze how the effect varies by changing the rate of the magnetic field ramp. Our results show that the intensity of the effect increases with the magnetic field change rate. We also have obtained the effective heat capacity of the system without the sample by performing calorimetric measurements using a pulse heat method, fitting the temperature change with a two tau description. With this analysis, we are able to describe the influence of the environment and subtract it to calculate the adiabatic temperature change of the sample. © 2012 Elsevier B.V.
Registro:
| Documento: | Artículo |
| Título: | Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters |
| Autor: | Rotstein Habarnau, Y.; Bergamasco, P.; Sacanell, J.; Leyva, G.; Albornoz, C.; Quintero, M. |
| Filiación: | Departamento Materia Condensada, CAC, CNEA, Av. Gral Paz 1429, San Martin 1650, Argentina Departamento de Física, FCEN, Ciudad Universitaria Pab. i, Buenos Aires 1428, Argentina Escuela de Ciencia y Tecnología, UNSAM, San Martín, Buenos Aires 1650, Argentina |
| Palabras clave: | Adiabatic temperature change; Calorimetric measurements; Differential thermals; Experimental parameters; Experimental setup; External magnetic field; Low temperatures; Magnetic entropy; Metamagnetic transitions; Phase separation effects; Temperature changes; Differential thermal analysis; Magnetic materials; Magnetocaloric effects; Manganese oxide; Phase separation; Magnetic fields |
| Año: | 2012 |
| Volumen: | 407 |
| Número: | 16 |
| Página de inicio: | 3305 |
| Página de fin: | 3307 |
| DOI: | http://dx.doi.org/10.1016/j.physb.2011.12.094 |
| Título revista: | Physica B: Condensed Matter |
| Título revista abreviado: | Phys B Condens Matter |
| ISSN: | 09214526 |
| CODEN: | PHYBE |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3305_RotsteinHabarnau |
Referencias:
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Citas:
---------- APA ----------
Rotstein Habarnau, Y., Bergamasco, P., Sacanell, J., Leyva, G., Albornoz, C. & Quintero, M. (2012) . Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters. Physica B: Condensed Matter, 407(16), 3305-3307.http://dx.doi.org/10.1016/j.physb.2011.12.094
---------- CHICAGO ----------
Rotstein Habarnau, Y., Bergamasco, P., Sacanell, J., Leyva, G., Albornoz, C., Quintero, M. "Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters" . Physica B: Condensed Matter 407, no. 16 (2012) : 3305-3307.http://dx.doi.org/10.1016/j.physb.2011.12.094
---------- MLA ----------
Rotstein Habarnau, Y., Bergamasco, P., Sacanell, J., Leyva, G., Albornoz, C., Quintero, M. "Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters" . Physica B: Condensed Matter, vol. 407, no. 16, 2012, pp. 3305-3307.http://dx.doi.org/10.1016/j.physb.2011.12.094
---------- VANCOUVER ----------
Rotstein Habarnau, Y., Bergamasco, P., Sacanell, J., Leyva, G., Albornoz, C., Quintero, M. Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters. Phys B Condens Matter. 2012;407(16):3305-3307.http://dx.doi.org/10.1016/j.physb.2011.12.094
