Hydrostatic pressure effect on magnetic phase transition and magnetocaloric effect of metamagnetic TmZn compound

Abstract

The magnetocaloric effect (MCE) is an intrinsic thermal response of all magnetic solids which has a direct and strong correlation with the corresponding magnetic phase transition. It has been well recognized that the magnetic phase transition can be tuned by adjusting applied pressure. Therefore, we perform the high hydrostatic pressure magnetization measurements (up to 1.4 GPa) on a recently reported giant MCE material of TmZn. The results indicate that the Curie temperature of TC increases from 8.4 K at the ambient pressure to 11.5 K under the pressure of 1.4 GPa. The field-induced first order metamagnetic transition is getting weak with increasing pressure, which results in a reduction of MCE. The hydrostatic pressure effect on the magnetic phase transition and MCE in the metamagnetic TmZn is discussed.

Achievement of a table-like magnetocaloric effect in the dual-phase ErZn2/ErZn composite

“…For examples, a table-like MCE from 20 to 160 K together with very large RC values were observed in Eu 4 PdMg [13]. A giant low-field reversible MCE around 8 K was reported in TmZn which is related to the field-induced metamagnetic (first ordered) magnetic transition [16], additionally, the MCE and metamagnetic transition in TmZn can be gradually suppressed by hydrostatic pressure [17]. According to the phase diagram of ErZn system, the ErZn compound could co-exist with ErZn 2 compound in a wide range [18], thus, the structure, magnetic properties, and MCE in dual-phase ErZn 2 /ErZn composite were investigated in this letter, and a table-like MCE together with large RC was observed.…”

“…Dual-phase ErZn 2 /ErZn composite; metal matrix composites; magnetic properties magnetocaloric effect; large refrigeration capacity; magnetic refrigeration Nowadays, the interest of magnetic materials with giant/large magnetocaloric effect (MCE) has considerably grown because of their potential application for magnetic refrigeration (MR) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. MCE can be characterized by the magnetic part of entropy change ( S M ) in an isothermal process and the temperature change ( T ad ) in an adiabatic process when the magnetic field is applied or removed which is an intrinsic behaviour for all magnetic solids.…”

Thermodynamics of a model solid with magnetoelastic coupling

“…The description of the caloric effects for the case of many interacting subsystems constitutes an interesting problem in thermodynamics and is crucial for the correct modeling of real materials. What additionally boosts the interest in magnetoelastic systems is that the presence of the coupling paves the way to tuning the magnetocaloric properties with external pressure [49][50][51][52]. Therefore, microscopic models of systems with interacting lattice and magnetic components are highly desired also from magnetocaloric point of view.…”

Fe doping effect on EuTiO3: The magnetic properties and giant magnetocaloric effect

“…The larger RC is attributed to the larger −Δ S M due to magnetic state switched with substituting Fe 3+ ions for Ti 4+ ions. It is a fact that present MCE parameters, especially under low magnetic field, are better than most of recently reported promising MCE materials, such as TmZn, ErMn2Si2, TmCuAl, etc., and much better than the ceramics oxides such as, RE 2 BaCuO 5 , RE 2 Mn 2 O 7 , etc.…”