Unconventional metamagnetic phase transition in R2In (R=Nd, Pr) with lambda-like specific heat and nonhysteresis

doi:10.1016/j.jmst.2021.05.055

Abstract

Abstract:

The phase transition of Nd₂In and Pr₂In has been studied and found to be between the first-order and second-order nature. Hardly any hysteresis nor obvious cell volume changes are presented. Concurrently the field-triggered metamagnetism is demonstrated with lambda-like peak on specific heat curve. For the field change of 7 T, giant magnetic entropy changes of 13.2 J kg^-1 K^-1 and 19.5 J kg^-1 K^-1 and adiabatic temperature changes of 6.5 K and 7.4 K have been achieved in Nd₂In and Pr₂In alloys respectively, which is partially contributed by strong magnetoelastic coupling represented by high saturation magnetostriction of ∼450 ppm. Such unique feature is proposed to be originated from the delocalized 5d electrons, as evidenced by the negative magnetoresistance caused by the phase transition.

Key words: Metamagnetic transition, Magnetic entropy change, Magnetocaloric effects, Magnetostriction

Weibin Cui, Guiquan Yao, Shengyu Sun, Qiang Wang, Sen Yang. Unconventional metamagnetic phase transition in R₂In (R=Nd, Pr) with lambda-like specific heat and nonhysteresis[J]. J. Mater. Sci. Technol., 2022, 101: 80-84.

Figures/Tables 7

Fig. 1. (a) The ambient XRD patterns of Nd2In and Pr2In alloys with that of Nd2In phase recorded at 80 K. The temperature-dependent lattice parameters (b) a, (c) c and (d) unit cell volume of Nd2In phase.

Fig. 2. Temperature-dependent magnetization curves measured under (a) 0.05 T and (b) 7 T for Nd2In and Pr2In alloys in the heating and cooling processes.

Fig. 3. (a, d) The isothermal magnetization curves, (b, e) field-dependent dM/dμ0H curves, (c, f) Arrot plots recorded around Tc for Nd2In and Pr2In alloys respectively. The dashed M-H curves were recorded during the field-decreasing process and overlapped with those in the field-increasing processes, indicating the nonhysteretic metamagnetism.

Fig. 4. The comparisons of temperature-dependent (a) magnetic entropy change (-ΔS) and (b) adiabatic temperature change (ΔTad) of Nd2In and Pr2In alloys for the field change of 5 T (closed symbols) and 7 T (open symbols).

Fig. 5. Temperature-dependent (a) specific heat (Cp) measured under 0 T (squares) and 5 T (circles) respectively, (b) saturation magnetostrictions (λs), (c) ΔR/R for Nd2In and Pr2In alloys. Here, λs is defined as the magnetostriction measured at 7 T and ΔR/R is defined as [R(5 T)-R(0 T)]/R(0 T) × 100% at a given temperature.

Table 1 The comparisons on the pressure-driven shift (dTt/dP) on transition temperature and the volume relative changes (ΔV/V) in several typical FOMPT systems.

Alloys	\|dT_t/dP\|(K/GPa)	\|ΔV/V\|(%)	Alloys	\|dT_t/dP\|(K/GPa)	\|ΔV/V\|(%)
Ni_49.26Mn_36.08In_14.66	18	0.2³⁵	Fe₄₉Rh₅₁	54	1.2⁴¹
Gd₅Si₂Ge₂	32	0.5³⁶	Lu(Co_0.9Ga_0.1)₂	93	0.2⁴²
LaFe_11.33 Co_0.47Si_1.2	73	1.2³⁷	MnCrCoGe	70⁴³	2.6⁴⁴
La(Fe_0.88Si_0.12)₁₃	94	1³⁸	Eu₂In	2	0.1¹⁶
Mn₃GaN	65	1.2³⁹	Pr₂In	1.9	∼0.01²⁷
MnAs	165	2.1⁴⁰	Nd₂In	∼1.5	<0.1

Fig. 6. Temperature dependence of exponent n for (a) Nd2In and (b) Pr2In phases. The maximum applied field is 7 T for the calculation of magnetic entropy changes. Here, n is extracted from ΔSM∝μ0Hn.

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Unconventional metamagnetic phase transition in R₂In (R=Nd, Pr) with lambda-like specific heat and nonhysteresis

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