Large adiabatic temperature and magnetic entropy changes in EuTiO3
A. Midya, P. Mandal, Km Rubi, Ruofan Chen, Jian-Sheng Wang, R., Mahendiran, G. Lorusso, and M. Evangelisti
TL;DR
This study demonstrates that EuTiO3 exhibits a giant magnetocaloric effect near its Neel temperature, making it a promising material for low-temperature magnetic refrigeration applications.
Contribution
It reports the first detailed measurement of large adiabatic temperature and magnetic entropy changes in EuTiO3, highlighting its potential for magnetic cooling below 20 K.
Findings
Magnetic entropy change of 49 Jkg-1K-1 at 7 T
Adiabatic temperature change of 21 K at TN
Similar magnetocaloric effects in single and polycrystalline samples
Abstract
We have investigated the magnetocaloric effect in single and polycrystalline samples of quantum paraelectric EuTiO3 by magnetization and heat capacity measurements. Single crystalline EuTiO3 shows antiferromagnetic ordering due to Eu2+ magnetic moments below TN = 5.6 K. This compound shows a giant magnetocaloric effect around its Neel temperature. The isothermal magnetic entropy change is 49 Jkg-1K-1, the adiabatic temperature change is 21 K and the refrigeration capacity is 500 JKg-1 for a field change of 7 T at TN. The single crystal and polycrystalline samples show similar values of the magnetic entropy change and adiabatic temperature changes. The large magnetocaloric effect is due to suppression of the spin entropy associated with localized 4f moment of Eu2+ ions. The giant magnetocaloric effect together with negligible hysteresis, suggest that EuTiO3 could be a potential material…
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