Journal ArticleDOI
Volume dependence of the first-order transition temperature for RCo2 compounds
Reads0
Chats0
TLDR
In this paper, the authors studied the volume dependence of the first-order transition temperature TC' by using the expansion of the free energy up to the M6 term, and showed that large experimental values of d ln TC'/d ln V for DyCo2, HoCo2 and ErCo2 can be explained by this model.Abstract:
The magnetic free energy in the so-called s-d model where the itinerant d electrons and localised spins coexist is expanded in a power series of the total magnetisation M. The first-order transition observed for DyCo2, HoCo2 and ErCo2 is explained from the negative values of the coefficient of the M4 term at TC where the paramagnetic susceptibility diverges in the expansion of the free energy. Volume dependence of the first-order transition temperature TC' is studied by using the expansion of the free energy up to the M6 term. It is shown that large experimental values of d ln TC'/d ln V for DyCo2, HoCo2 and ErCo2 can be explained by this model.read more
Citations
More filters
Journal ArticleDOI
Theoretical aspects of the magnetocaloric effect
N.A. de Oliveira,P.J. von Ranke +1 more
TL;DR: In this paper, the theoretical aspects of the magnetocaloric effect in rare earth metals and their alloys as well as in transition metal based compounds are discussed by using model Hamiltonians of interacting localized magnetic moments.
Journal ArticleDOI
Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions
C. M. Bonilla,Julia Herrero-Albillos,Fernando Bartolomé,Luis Miguel García,M. Parra-Borderías,Victorino Franco +5 more
TL;DR: In this article, the authors studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, RCo2, and mixed manganites, La2/3CaxSr1�x1/3MnO3, which exhibit first and second-order phase transitions.
Journal ArticleDOI
Review of the structural, magnetic and magnetocaloric properties in ternary rare earth RE2T2X type intermetallic compounds
TL;DR: In this paper, the magnetic properties and magnetocaloric effect (MCE) in ternary rare earth RE2T2X intermetallic compounds are reviewed in the field of magnetic refrigeration at low temperature.
Journal ArticleDOI
Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metals
Ling-Wei Li,Ling-Wei Li +1 more
Journal ArticleDOI
Itinerant electron metamagnetism and magnetocaloric effect in RCo2-based Laves phase compounds
TL;DR: In this paper, a comparative study of the magnetic and magnetocaloric properties of RCo 2-based compounds under various substitutions and applied pressure is presented, and it is found that the spin fluctuations arising from the magnetovolume effect reduce the strength of IEM, which subsequently leads to a reduction in the MCE.
References
More filters
Journal ArticleDOI
Intermetallic rare-earth compounds.
TL;DR: The physical properties of many of the rare-earth intermetallic compounds have been discussed in terms of the role that the magnetic exchange and crystal field interactions play in determining these properties.
Journal ArticleDOI
Itinerant electron magnetism
TL;DR: The many theoretical studies of the various magnetic, thermal and magnetoelastic properties for paramagnetic and ferromagnetic transition metals and alloys in the simple itinerant electron model are reviewed in this article.
Journal ArticleDOI
First order transitions in ACo 2 compounds
TL;DR: In this article, the Stoner theory is used to relate the behaviour of B to the existence of a maximum in the susceptibility of YCo2 as a function of temperature, where the applied field is the molecular field due to Gd moments and the magnetization of GdxY1-xCo2 is discussed from this point of view.
Journal ArticleDOI
Itinerant-Electron Theory of Pressure Effects on Ferromagnetic Transition Temperatures: Ni and Ni-Cu Alloys
N. D. Lang,H. Ehrenreich +1 more
Journal ArticleDOI
Metallic alloys and exchange-enhanced paramagnetism: application to rare- earth--cobalt alloys.
D. Bloch,R. Lemaire +1 more
TL;DR: A phenomenological theory of the magnetic properties of two-component alloys, one of whose components has a permanent magnetic moment, and the other an exchange-enhanced paramagnetic susceptibility, was presented in this article.