Nearly constant magnetic entropy change and adiabatic temperature change in PrGa compound

Abstract

Effect of magnetic polarons on the magnetic, magnetocaloric, and magnetoresistance properties of the intermetallic compound HoNiAl Large magnetic entropy change in the metallic antiperovskite Mn 3 GaCThe magnetic properties and magnetocaloric effect (MCE) of PrGa compound are studied in detail. Both thermomagnetization curves and heat capacity curves indicate that PrGa compound undergoes a transition from ferromagnetic (FM) to antiferromagnetic (AFM) phase at T t $ 27 K and a transition from AFM to paramagnetic (PM) phase at T 0 $ 37 K with increasing temperature. As the applied field increases, the magnetic state between T t and T 0 shows an obvious metamagnetic transition from AFM to FM state. The magnetic entropy change (DS M ) calculated from magnetic property measurement and that obtained from heat capacity measurement are in good agreement with each other above 25 K. Instead of peak like distribution, nearly constant value of DS M in a temperature range from 29.5 K to 37.5 K is observed when the field change is 0-5 T. The adiabatic temperature change (DT) also shows similar change rules. This characteristic of MCE is very important for the practical applications of magnetic refrigerant materials. V C 2014 AIP Publishing LLC. [http://dx.

The physical mechanism of magnetic field controlled magnetocaloric effect and magnetoresistance in bulk PrGa compound

“…We also studied the thermal expansion, MCE and MR of PrGa compounds in details 8 . Our previous studies showed that a nearly constant value of ΔS M was observed when the field changes from 0 to 5 T 19 . A nearly constant ΔS M has also been observed in LaFe 11.44 Al 1.56 compound 20 , while the cause of plateau on the MCE curve in PrGa compound is different from that in LaFe 11.44 Al 1.56 compound.…”

“…However, no SR transition is observed in PrGa according to the previous Mössbauer spectroscopy experiment 18 . The magnetic property, MR and MCE of PrGa compound have been reported 8 19 , but the magnetic structure and physical mechanism of MR and MCE are still not clear.…”

Large magnetocaloric effect of NdGa compound due to successive magnetic transitions

“…33 In addition, interesting magnetic properties, transport properties and MCEs were also found in TmGa and PrGa compounds. [34][35][36][37] In this paper, we investigate the magnetic properties and MCEs of NdGa compound. The correlations between MCE and magnetic transitions will be discussed.…”

Spin-reorientation in DyGa

“…The RGa (R¼ rare earth) compounds have been known since the 1960s [1][2][3][4] and are enjoying a revival of interest due to their possible use in low-temperature magnetocaloric refrigeration applications [5][6][7][8][9][10][11][12]. They crystallise in the orthorhombic CrB-type Cmcm structure with both the R and Ga atoms occupying 4c sites with the m2m point symmetry.…”