Giant low-field magnetocaloric effect in single-crystalline EuTi0.85Nb0.15O3

Roy, S. ; Khan, N. ; Mandal, P. (2016) Giant low-field magnetocaloric effect in single-crystalline EuTi0.85Nb0.15O3 APL Materials, 4 (2). 026102. ISSN 2166-532X

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Official URL: http://doi.org/10.1063/1.4940960

Related URL: http://dx.doi.org/10.1063/1.4940960

Abstract

The magnetocaloric effect in ferromagnetic single crystal EuTi0.85Nb0.15O3 has been investigated using magnetization and heat capacity measurements. EuTi0.85Nb0.15O3 undergoes a continuous ferromagnetic phase transition at TC = 9.5 K due to the long range ordering of magnetic moments of Eu2+ (4f7). With the application of magnetic field, the spin entropy is strongly suppressed and a giant magnetic entropy change is observed near TC. The values of entropy change ΔSm and adiabatic temperature change ΔTad are as high as 51.3 J kg−1 K−1 and 22 K, respectively, for a field change of 0–9 T. The corresponding magnetic heating/cooling capacity is 700 J kg−1. This compound also shows large magnetocaloric effect even at low magnetic fields. In particular, the values of ΔSm reach 14.7 and 23.8 J kg−1 K−1 for field changes of 0–1 T and 0–2 T, respectively. The low-field giant magnetocaloric effect, together with the absence of thermal and field hysteresis makes EuTi0.85Nb0.15O3 a very promising candidate for low temperature magnetic refrigeration.

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Deposited On:16 Aug 2021 11:45
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