Giant magnetocaloric effect in MnAs1−xPx in a cyclic magnetic field: Lattice and magnetic contributions and degradation of the effect

Abstract

In this report, we present results of the direct measurements of the adiabatic temperature change in MnAs1−xPx compounds (x = 0, 0.02, 0.025, and 0.03) in cyclic magnetic fields up to 8 T. The substitution of As by P results in a slight shift of the Curie temperature and more notable change in the magnetocaloric effect (MCE) value. Estimations of the lattice and magnetic contributions show that in the MnAs compound, the lattice contribution dominates (about 70% of the total MCE). Substitution of As with phosphorus leads to a decrease in the total value of the MCE, which is caused by a decrease in the lattice contribution, and the magnetic contribution almost does not change in the absolute value. A reversible degradation of the magnetocaloric effect in cyclic magnetic fields is found, which restricts the application of this material to the magnetic cooling technology.

The magnetic, thermal transport properties, magnetothermal effect and critical behavior of Co3Sn2S2 single crystal

“…The $$ - {{\Delta}}S_M^{max}$$ value under each magnetic field H can be obtained from Figure 5C, as shown in the inset of Figure 9. The fitted n value according to Equation () is 0.65, which is very close to 0.66, 20 the value common for the SOPT materials. But this value deviates from the expected value of 2/3 by the mean‐field model, 47 indicating that the FM state of Co 3 Sn 2 S 2 along the c ‐axis is not a long‐range ordering, because the spin fluctuation is not considered in the mean‐field model.…”

“…18 The MCE study is of great significance for the fundamental research and practical applications. So far, the MCE has been widely investigated for the molecular nanomagnets, 19 alloys, 20,21 perovskite manganites, [22][23][24] spinel ferrite 25 and quantum spin liquid materials. 26 However, few reports focus on the MCE of kagome magnets such as Co 3 Sn 2 S 2 .…”

Indirect Exchange Interaction Leads to Large Lattice Contribution to Magnetocaloric Entropy Change

“…Hence, ASD simulations need to be modified to account for the lattice vibrations and explicitly include the dependence of the spin exchange interactions on the dynamical lattice positions in order to simulate the dynamics of materials with strong spin-lattice coupling. [28,29] For this purpose, spinlattice dynamics (SLD) simulations add the lattice dynamics and the lattice-dependent spin exchange interactions to the ASD simulations and have been reported to be an effective tool to predict magnetic and thermodynamic properties of magnetic materials more accurately. [30][31][32][33] However, SLD simulations have not been applied to analyze the spin and lattice contributions to the magnetocaloric entropy change thus far.…”

Magnetocaloric properties of phenolic resin bonded La(Fe,Si)13-based plates and its use in a hybrid magnetic refrigerator

“…[6] An AMR is generally a porous bed of magnetocaloric material which simultaneously acts as a refrigerant to generate cooling and a conventional regenerator to exchange heat with the heat transfer fluid and build up a temperature gradient. [6] Most recently, the discovery of room-temperature giant magnetocaloric materials, such as Gd 5 (Si x Ge 1−x ) 4 , [7][8][9] La(Fe,Si) 13 , [10,11] MnAs-based compounds, [12][13][14] NiMn-based, [15][16][17] and La 1−x Ca x MnO 3 manganite, [18][19][20] has pushed the magnetic refrigeration technology a big step forward. Among these magnetocaloric materials, La(Fe,Si) 13 -based compounds are widely accepted as one of the most promising candidates due to their easy and environmentally friendly preparation, low cost, non-toxic constituent elements, and excellent magnetocaloric effect.…”