Magnetocaloric effects in RCo2 compounds

Duc, Nguyen Huu; Anh, Do Thi Kim

doi:10.1016/s0304-8853(01)01328-2

Cited by 65 publications

(49 citation statements)

References 4 publications

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“…[1][2][3][4] In particular, the study of the Co band has been the subject of intense investigation for decades. [5][6][7][8][9][10][11][12][13] In these compounds, the Co sublattice is near the critical condition for the formation of magnetic moment, turning the Co 3d-electron system very sensitive to the internal field created by the R sublattice or to changes of external parameters. Particularly unique is the case of the Co sublattice in ErCo 2 , as it is just above the condition for undergoing a metamagnetic transition.…”

Section: Introductionmentioning

confidence: 99%

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

et al. 2011

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Zero-field muon spin relaxation spectroscopy (μSR) measurements in the paramagnetic phase of ErCo 2 ferrimagnetic system are reported. Previous experimental studies using macro-and microscopic techniques led to the identification of magnetic short-range correlations between the Co atoms in the paramagnetic state of this material. The analysis of μSR spectra recorded on ErCo 2 well above T c indicates two dynamical magnetic processes characterized by remarkably different relaxation rates: a slow-relaxing signal, which quantitatively coincides with previous μSR studies on ErAl 2 , and fast-relaxing signal, which can be ascribed to the Co short-range correlated regions observed above T c . Moreover, the μSR technique provides information on the thermal dependence of Co correlated regions at true zero field. These findings shed light on the dynamical nature of the clustered phase developing in the paramagnetic state of ErCo 2 .

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Section: Introductionmentioning

confidence: 99%

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

et al. 2011

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“…3 On the other hand, high RC values depend on both the height and the width of the ⌬S M curve. 4 Although compounds with SOT show smaller ͉⌬S M peak ͉ than materials with FOT, the compromise between an optimal RC and the lack of hysteresis currently makes compounds with SOT better candidates for the development of magnetic cooling devices.…”

Section: A New Criterion To Distinguish the Order Of Magnetic Transitmentioning

confidence: 99%

“…The structural, electronic, and magnetic properties of these families of compounds have been well studied. 2,3,6,[13][14][15][16] The intermetallic RCo 2 samples with R = Tb, Pr, and Dy were prepared by using an induction furnace under Ar atmosphere. The alloys were later annealed under Ar atmosphere at 850°C for 8-12 days depending on the sample.…”

Section: A New Criterion To Distinguish the Order Of Magnetic Transitmentioning

confidence: 99%

A new criterion to distinguish the order of magnetic transitions by means of magnetic measurements

Bonilla

Bartolomé

Garcı́a

et al. 2010

Journal of Applied Physics

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A universal curve for the magnetic entropy change has been found to exist for a variety of materials with second order phase transitions. We have studied whether this universal behavior of the magnetocaloric effect is maintained in materials with first order phase transition, including RCo2 Laves phases and mixed La2/3(CaxSr1−x)1/3MnO3 manganites, which present both second order and first order magnetic ordering phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve only for materials with second order phase transition. This universal curve may be used as a criterion for determining the order of magnetic phase transitions from purely magnetic measurements.

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“…In this context, RCo 2 intermetallic compounds are among the attractive candidates. According to [4,5], the ferrimagnetic-paramagnetic phase transformations in RCo 2 compounds with heavy rareearth elements are first-order transitions, and, thus, these compounds exhibit a large magnetic entropy change. The magnetic moment at Co atoms in RCo 2 compounds is induced by exchange interaction with rare-earth moments [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Magnetocaloric Effect in the Pseudo Binary Laves-Phase Compounds

Ćwik

2014

J Supercond Nov Magn

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Polycrystalline samples of DyCo 2 , HoCo 2 , ErCo 2 and their solid solutions Dy 1-x Ho x Co 2 , Dy 1-x Er x Co 2 , Ho 1-x Er x Co 2 have been studied using X-ray diffraction analysis, heat capacity and magnetic measurements. The Xray diffraction performed at room temperature allowed to reveal that all solid solutions solidify with the formation of the C15 cubic Laves-phase structure corresponding to the Fd3m space group. All binary compounds and their solid solutions are typical ferrimagnets and are magnetically ordered at temperature below 140 K. In all doped solid solutions an decrease of the magnetic ordering temperature is observed. At high temperatures, all samples are CurieWeiss paramagnets. The magnetization behaviour and the magnetic transition are analyzed in terms of Landau theory. The magnetocaloric effect has been estimated using the heat capacity data.Comparison of the influence of doping effect in pseudo-binary compounds on their magnetic and magnetocaloric properties for all solid solutions is presented.

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Magnetocaloric effects in RCo2 compounds

Cited by 65 publications

References 4 publications

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

A new criterion to distinguish the order of magnetic transitions by means of magnetic measurements

Experimental Study of the Magnetocaloric Effect in the Pseudo Binary Laves-Phase Compounds

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