Magnetocaloric effect in DyCu2

Arora, Parul; Tiwari, Pragya; Sathe, Vasant; Chattopadhyay, M. K.

doi:10.1016/j.jmmm.2009.05.062

Cited by 26 publications

(13 citation statements)

References 32 publications

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“…Figure 4(a) shows the isothermal magnetization as a function of magnetic field for the hexagonal HoPdAl around T N with different temperature steps in the range of 2-70 K. One can find that the isothermal M-H curves exhibit typical FM nature at temperatures lower than T N and a linear relation in the PM state for temperatures much higher than T N . However, the isothermal magnetization curves obtained well above T C show strong curvatures at low fields as shown in other intermetallic compounds [11,14,29]. The curvatures in the M-H curves probably indicate the existence of short-range FM correlations in the PM state, which is in accordance with the result of positive  p (see the inset of Figure 2(a)).…”

Section: Resultssupporting

confidence: 83%

Large magnetocaloric effect in metamagnetic HoPdAl

Shen

2011

Sci. China Technol. Sci.

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Magnetic properties and magnetocaloric effects (MCEs) of the HoPdAl compounds with the hexagonal ZrNiAl-type and the orthorhombic TiNiSi-type structures are investigated. Both the compounds are found to be antiferromagnet with the Néel temperature T N =12 and 10 K, respectively. A field-induced metamagnetic transition from antiferromagnetic (AFM) state to ferromagnetic (FM) state is observed below T N . For the hexagonal HoPdAl, a small magnetic field can induce an FM-like state due to a weak AFM coupling, which leads to a high saturation magnetization and gives rise to a large MCE around T N . The maximal value of magnetic entropy change (S M ) is 20.6 J/kg K with a refrigerant capacity (RC) value of 386 J/kg for a field change of 0-5 T. For the orthorhombic HoPdAl, the critical field required for metamagnetic transition is estimated to be about 1.5 T, showing a strong AFM coupling. However, the maximal S M value is still 13.7 J/kg K around T N for a field change of 0-5 T. The large reversible S M and considerable RC suggest that HoPdAl may be an appropriate candidate for magnetic refrigerant in a low temperature range. HoPdAl compound, magnetocaloric effect, metamagnetic transitionCitation:

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Section: Resultssupporting

confidence: 83%

Large magnetocaloric effect in metamagnetic HoPdAl

Shen

2011

Sci. China Technol. Sci.

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“…Similar results have been observed in many other intermetallic compounds. [18][19][20] To investigate the reversibility of the magnetic transitions for ErGa, the M-H curves were measured, respectively, in field increasing and decreasing modes around transition temperatures. There is almost no magnetic hysteresis in each curve, indicating the perfect magnetic reversibility of the magnetic transitions in ErGa.…”

Section: Based On A͒mentioning

confidence: 99%

Large reversible magnetocaloric effect caused by two successive magnetic transitions in ErGa compound

Chen¹,

Shen²,

Dong³

et al. 2009

Applied Physics Letters

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Intermetallic compound ErGa exhibits two successive magnetic transitions: spin-reorientation transition at TSR=15 K and ferromagnetic-paramagnetic transition at TC=30 K. Both transitions contribute greatly to the magnetic entropy change (ΔSM), each yielding a significant peak on their ΔSM-T curve and thus a considerable value of refrigerant capacity (RC) without hysteresis loss. For a magnetic field change of 5 T, the maximal values of −ΔSM are 21.3 J/kg K at TC and 16.5 J/kg K at TSR, with an RC value of 494 J/kg. Large reversible magnetocaloric effect and RC indicate the potentiality of ErGa as a candidate magnetic refrigerant at low temperatures.

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“…[1][2][3][4] Apart from the interest in understanding the magnetic properties of these compounds, the materials having magnetic phase transitions below 50 K are also interesting from technological points of view as potential magnetic refrigerants or as passive magnetic regenerators in cryogenic refrigeration and gas liquefaction cycles. [5][6][7] We have recently highlighted the interesting magnetic properties of the rare earth binary compounds DyPt 2 , 8 DyCu 2 , 9 and DyAg 2 , 10 which include temperature and magnetic field induced phase transitions, and the presence of short range magnetic correlations well above their magnetic ordering temperatures. The magnetic transitions and short range magnetic correlations in turn give rise to large magnetocaloric effect (MCE) below 50 K in these rare earth compounds, which suggests the utility of these materials as potential magnetic refrigerants.…”

Section: Introductionmentioning

confidence: 99%

Multiple magnetic transitions in Ag-substituted DyPt2

Arora

Chattopadhyay

Chandra

et al. 2012

Journal of Applied Physics

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We show that the partial substitution of Ag in place of Pt in the cubic Laves phase ferromagnetic (below 9.2 K) compound DyPt 2 leads to multiple temperature and field induced magnetic phase transitions. We study these phase transitions in details in a Dy(Pt 0.94 Ag 0.06 ) 2 alloy with the help of magnetization and specific heat measurements. One of the magnetic transitions produces an unusually sharp peak in the temperature dependence of heat capacity of Dy(Pt 0.94 Ag 0.06 ) 2 , which is not observed in either of the parent compounds DyPt 2 or DyAg 2 . The shape of this peak resembles those observed in the temperature dependence of heat capacity of the rare earth elements and some rare-earth based alloys and compounds across first order magnetic transitions accompanied by magneto-elastic effects and structural changes. The magnetic properties of Dy(Pt 0.94 Ag 0.06 ) 2 are analyzed in terms of the enhancement of crystal field effect and quadrupolar interactions. Large magneto-elastic coupling resulting from these interactions and changes in the electronic density of states near Fermi level because of the chemical substitution seem to introduce into the system the temperature and field induced multiple magnetic phase transitions mentioned above. V C 2012 American Institute of Physics. [http://dx.

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Magnetocaloric effect in DyCu2

Cited by 26 publications

References 32 publications

Large magnetocaloric effect in metamagnetic HoPdAl

Large magnetocaloric effect in metamagnetic HoPdAl

Large reversible magnetocaloric effect caused by two successive magnetic transitions in ErGa compound

Multiple magnetic transitions in Ag-substituted DyPt2

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