Abstract
The structural and magnetic properties of the compounds NdMn2-xVxSi2 have been studied by x-ray and high resolution neutron powder diffraction, specific heat, dc magnetization, and differential scanning calorimetry measurements over the temperature range 3-450 K. The Curie temperature and Néel temperature of layered NdMn1.9V0.1Si2 are been indicate at TC ~ 24 K and TN ~ 376 K respectively. The giant magnetocaloric effect (GMCE) around TC is found in layered NdMn1.9V0.1Si2 associated with first order magnetic transition from antiferromagnetic [AFil-type] to ferromagnetic [F(Nd)+Fmc]. This behaviorhas been confirmed as contribution of the magnetostructural coupling by using neutron powder diffraction. The magnetic entropy change −ΔSM ~ 25.4J kg-1 K-1 and adiabatic temperature change ΔTad~ 6.7 K have been determined using magnetization and specific heat measurement under 0-8 T field applied. This compound belongs with the small thermal ~ 0.8 K and magnetic ~ 0.1 T hysteresis characteristic providing high potential material for magnetic refrigerator.
Highlights
The study of the magnetocaloric effect (MCE) has become an interesting area of research in the field of magnetic materials, with increasing prospects as the basis of magnetic cooling to replace conventional refrigeration [1,2,3,4]
The temperature dependence of the magnetization of NdMn1.9V0.1Si2 measured in a magnetic field of B = 0.01 T over the temperature range ~ 10-300 K is shown in figure 2 together with the differential scanning calorimetry (DSC) curves over the temperature range ~ 300-450 K
Substitution of V for Mn leads to decreases in the Curie temperature and the Néel temperature from TC ~ 36 K and TN ~ 380 K for NdMn2Si2 to TC ~ 24 K and TN ~ 376 K
Summary
The study of the magnetocaloric effect (MCE) has become an interesting area of research in the field of magnetic materials, with increasing prospects as the basis of magnetic cooling to replace conventional refrigeration [1,2,3,4]. Magnetic materials with large MCE have been extensively studied experimentally and theoretically; the first order magnetic phase transition is accompanied by large thermal and field hysteresis in the temperature and magnetic field dependent magnetization. This behavior limits their usage in practical applications. The research objective in probing suitable new materials is to find a large MCE that is free from any hysteresis Such compounds need further investigation, and it is really important to understand their basic properties which contribute to the large MCE. We will investigate the effects of V substitution for Mn in NdMn2Si2 compound on the structural and magnetic propertieswhich are expected to increase the distance between magnetic atoms, modifying the magnetic states of both the Nd and the Mnsublattices
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