Anisotropic and excellent magnetocaloric properties of La0.7Ca0.3MnO3 single crystal with anomalous magnetization

Abstract

Anisotropic and excellent magnetocaloric properties of La 0.7Ca0.3MnO3 Anisotropic and excellent magnetocaloric properties of La 0.7Ca0.3MnO3 single Anisotropic and excellent magnetocaloric properties of La 0.7Ca0.3MnO3 single crystal with anomalous magnetization crystal with anomalous magnetization

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

“…The maximum values of $${{\Delta}}{T_{ad}}$$ are 1.8 K ( H // c ) and 0.2 K ( H // ab ), respectively, as H = 16 kOe. These values are smaller than the maximum $${{\Delta}}{T_{ad}}$$ (5.33 K as H = 5 T) 41 of the La 0.7 Ca 0.3 MnO 3 single crystal with the first‐order phase transition.…”

“…In the case of H // c , the maximum value of $$ - \Delta {S_M}$$, that is, $$ - \Delta S_M^{max}$$ appears near T c , because M changes abruptly around T c as can be seen in Figure 2A–E and Equation (). $$ - \Delta S_M^{max}$$ is 1.33 J/kg K as ∆ H = 65 kOe, common for many MCE materials with the SOPT, such as Pd x CoCrFeNi, 16,39 but smaller than that for the polycrystalline (8.63 J/kg K as ∆ H = 4.5 T) 40 and single crystal (6.41 J/kg K as ∆ H = 5.0 T) 41 La 0.7 Ca 0.3 MnO 3 with the first‐order phase transition.…”

“…Another important parameter of MCE is the adiabatic temperature change $${{\Delta}}{T_{ad}}$$ 41 normalΔTad${{\Delta}}{T_{ad}}$ at any temperature can be estimated from 45,46 : $$\begin{equation}{{\Delta}}{T_{ad}} \cong - \frac{T}{{{C_p}}}{{\Delta}}{S_M}\left( {T,H} \right)\end{equation}$$where C p is the specific heat at zero field.…”

“…Generally, a positive slope of the $${M^2}\sim H/M$$ curve in the high‐ H region reflects the SOPT behavior 17 . However, the negative slope in the low‐ M 2 range above T c is due to the first‐order phase transition 41 . For SOPT materials, $$ - {{\Delta}}S_M^{max}$$ near T c is exponentially dependent on magnetic field H , that is, $$\begin{equation} - {{\Delta}}S_M^{max} = a{H^n}\end{equation}$$…”

Anisotropic magnetic entropy change in RFeO3 single crystals(R = Tb, Tm, or Y)

“…Although the anisotropic MCE, which was discovered in Ni single crystal more than 70 years ago 23 , is lower than that from the paramagnetic-ferromagnetic phase transition, it should be large for materials with high values of derivatives of the MCA with respect to temperature 24 25 26 27 28 29 30 31 32 33 34 35 . Here, we explore the anisotropic magnetic entropy change of R FeO 3 single crystals with R = Tb, Tm or Y.…”