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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

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Anomalous barocaloric effect in solid magnetic materials.

R P Santana¹, N A de Oliveira, P J von Ranke

¹Instituto de Física Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, Rio de Janeiro, 20550-013, RJ, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|July 13, 2011

Summary

This study explores the barocaloric effect in magnetic materials. Researchers found pressure can induce normal, inverse, or anomalous effects by altering phase transition temperatures and orders.

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Area of Science:

Condensed Matter Physics
Materials Science
Thermodynamics

Background:

The barocaloric effect (BCE) is a phenomenon where temperature changes in materials due to applied pressure.
Understanding BCE is crucial for developing advanced solid-state cooling technologies.
Previous studies often focused on specific types of phase transitions or materials.

Purpose of the Study:

To systematically investigate the barocaloric effect in solid magnetic materials.
To analyze BCE in materials undergoing both first and second-order phase transitions.
To explore the influence of pressure on the nature and magnitude of the barocaloric effect.

Main Methods:

Utilized a theoretical model of localized magnetic moments.
Incorporated magnetoelastic coupling and Zeeman interaction into the model.
Performed calculations to simulate the behavior of magnetic materials under varying pressure conditions.

Main Results:

Normal and inverse barocaloric effects are observed when pressure modifies the critical temperature while preserving the phase transition order.
Anomalous barocaloric effects, including a sign change, are predicted when pressure alters the order of the phase transition (first to second order, or vice versa).
The study highlights the complex interplay between pressure, magnetic interactions, and phase transitions in determining BCE.

Conclusions:

The barocaloric effect in magnetic materials is highly sensitive to applied pressure, influencing both magnitude and sign.
Predicting and controlling the barocaloric response requires careful consideration of the material's phase transition characteristics.
This research provides a theoretical framework for designing materials with tailored barocaloric properties for caloric cooling applications.