Magnetic and magnetocaloric properties of the intermetallic compound ErCu2
23 May 2017-Vol. 1832, Iss: 1, pp 130059
TL;DR: ErCu2 compound has been prepared by arc melting in inert atmosphere and its magnetic and magnetocaloric properties have been studied ErCu2 orders antiferromagnetically at TN ~ 11 K and a field induced metamagnetic transition is observed in a field of ~85 kOe at 5 k which leads to saturation in magnetization to a value of max 84 µB/fu as mentioned in this paper.
Abstract: Polycrystalline ErCu2 compound has been prepared by arc melting in inert atmosphere and its magnetic and magnetocaloric properties have been studied ErCu2 orders antiferromagnetically at TN ~ 11 K A field induced metamagnetic transition is observed in a field of ~85 kOe at 5 K which leads to saturation in magnetization to a value of max 84 µB/fu The maximum isothermal magnetic entropy change, -ΔSmmax, value of this compound is obtained as 149 J/kg K for 50 kOe field change Corresponding refrigeration capacity and relative cooling power values are 334 J/kg and 412 J/kg, respectively These values are higher than that for HoCu2 and DyCu2 compounds because the temperature dependent isothermal magnetic entropy change curve of this ErCu2 compound is considerably broader
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TL;DR: In this article, magnetic and magnetocaloric properties of melt-spun RCu2 (R = Gd, Tb, Dy, Ho and Er) compounds have been studied.
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TL;DR: In this article , the surface effects on small antiferromagnetic (AF) nanoparticles with diameters ϕ ≤ 11 nm and Néel temperature TN ∼ 12 K under spin-flop conditions by means of Montecarlo simulations.
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TL;DR: In this paper, a general approach based on the concept that the most appropriate and meaningful measure of the level of refrigeration is the product of entropy absorbed by the refrigerant at the cycle cold temperature, ΔS c, and the temperature span, ΔT, over which it is pumped is presented.
364 citations
TL;DR: In this article, the magnetic properties of rare earth copper compounds were determined from the values of anisotropic paramagnetic Curie temperatures on the basis of the molecular field theory, which are in agreement with those evaluated from a point charge model.
Abstract: Measurements of magnetization and susceptibility have been made on single crystals of heavy rare earth copper compounds, RCu 2 . All these compounds show metamagnetism with a relative low critical field at 4.2 K. The paramagnetic Curie temperatures along each principal axis are anisotropic. The crystal field parameters V 2 0 and V 2 2 are determined from the values of anisotropic paramagnetic Curie temperatures on the basis of the molecular field theory. These values are in agreement with those evaluated from a point charge model. The neutron diffraction measurements on a TbCu 2 single crystal confirm the collinear magnetic structure.
70 citations
TL;DR: The magnetocaloric effect of the rare-earth intermetallic compound DyCu2 is explored through magnetization measurements in this article, where strong temperature and field dependence of magnetization at and around the Neel temperature lead to a large magnetocoric effect.
24 citations
TL;DR: In this paper, the authors report the observation of large low temperature magnetocaloric effect and magnetoresistance in the rare-earth based intermetallic compound HoCu2, which undergoes an antiferromagnetic type ordering below about 10.5 K, which is second order in nature.
Abstract: We report the observation of large low temperature magnetocaloric effect and magnetoresistance in the rare-earth based intermetallic compound HoCu2. The compound undergoes an antiferromagnetic type ordering below about TN = 10.5 K, which is second order in nature. The magnetocaloric effect in terms of entropy change under the application of 50 kOe of field is found to have a maximum value of −19.3 J kg−1 K−1 peaking around TN, and an appreciable value of relative cooling power of 268 J kg−1 was associated with it. The sample also shows giant negative magnetoresistance with its value as high as −36.5% around TN for 50 kOe of field. Field induced second order metamagnetic transition is found to be responsible for the observed magnetocaloric and magnetoresistance behaviors in the sample. The sample is devoid of any thermal or field hysteresis by virtue of the second order nature of the transitions, which enables us to exploit large reversible magnetic cooling at cryogenic temperatures.
12 citations