Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni1−xFex)2compounds

Singh, Niraj K.; Суреш, К. Г.; Rana, D. S.; Nigam, A. K.; Malik, S.K.

doi:10.1088/0953-8984/18/48/005

Cited by 17 publications

(7 citation statements)

References 28 publications

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“…This may be attributed to the presence of some magnetic randomness (disorder) at low temperatures in the Tb sublattice on substituting Fe at the Co site. A similar kind of broadening was reported in TbNi 2 on substituting Fe at the Ni site by Singh et al 35 which was due to the magnetic randomness in the Tb sublattice.…”

Section: A Magnetocaloric Effectsupporting

confidence: 81%

Magnetocaloric effect and critical behavior near the paramagnetic to ferrimagnetic phase transition temperature inTbCo2−xFex

et al. 2010

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Magnetocaloric effect (MCE) in TbCo 2-x Fe x has been studied by dc magnetization measurements.On substituting Fe in TbCo 2 , not only the magnetic transition temperature is tuned to room temperature, but also the operating temperature range for MCE is increased from 50 K for TbCo 2 to 95 K for TbCo 1.9 Fe 0.1 . The maximum magnetic entropy change (-ΔS M ) for TbCo 1.9 Fe 0.1 is found to be 3.7 J kg -1 K -1 for a 5 T field change, making it a promising candidate for magnetic refrigeration near room temperature. The temperature dependent neutron diffraction study shows a structural phase transition (from cubic to rhombohedral phase with lowering of temperature) which is associated with the magnetic phase transition and these transitions broaden on Fe substitution.To investigate the nature of the paramagnetic to ferrimagnetic phase transition, we performed a critical exponent study. From the derived values of critical exponents, we conclude that TbCo 2 belongs to the 3D Heisenberg class with short-range interaction, while on Fe substitution it tends towards mean-field with long-range interaction. The derived values of critical exponents represent the phenomenological universal curve for the field dependence of ΔS M , indicating that TbCo 2 and TbCo 1.9 Fe 0.1 belong to two different universality classes.PACS number(s): 75.30.Sg, 61.05.fm, 75.40.Cx * Electronic mail: smyusuf@barc.gov.in FAX: +91 22 25505151

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Section: A Magnetocaloric Effectsupporting

confidence: 81%

Magnetocaloric effect and critical behavior near the paramagnetic to ferrimagnetic phase transition temperature inTbCo2−xFex

et al. 2010

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“…The decrease in the magnitude of MCE with Fe or Co substitution is due to the reduction in the sharpness of the transition at the ordering temperature. We also find that the MCE behavior in these substituted compounds is more or less similar to that observed in Fe substituted RNi 2 compounds [13,14]. As in R(Ni,Fe) 2 case, it is clear from Fig.…”

Section: Resultssupporting

confidence: 75%

“…Since the ordering temperature increases with Co and Fe substitutions, comparatively larger lattice and electronic part (at high temperatures) of the heat capacity would mask the weak peak due to magnetic contribution. A similar behavior has been observed in substituted RNi 2 compounds also [13,14]. The nonmagnetic contribution arising from the lattice and electronic contributions was calculated from the zero field data.…”

Section: Resultssupporting

confidence: 71%

“…In this respect, they are similar to the RNi 2 compounds. The recent study of R(Ni,Fe) 2 series, in the context of magnetocaloric effect (MCE), shows various interesting results both from fundamental and application points of view [13,14]. With Fe substitution in place of Ni in HoNi 2 and TbNi 2 , the ordering temperature was found to increase significantly.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic, magnetocaloric and neutron diffraction studies on TbNi5−xMx (M=Co and Fe) compounds

Haldar¹,

Dhiman²,

Das³

et al. 2011

Journal of Alloys and Compounds

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a b s t r a c tThe effect of substitution of Co and Fe for Ni in TbNi 5 on the structural, magnetic and magneto-thermal properties has been investigated. Considerable enhancement of Curie temperature is observed with Fe substitution, whereas the increase is nominal in the case of Co. Neutron diffraction measurements reveal the redistribution of moments and site preference of substitutional ions in Ni 2c and 3g sites. In TbNi 4 Fe, both Ni and Fe as well as Tb are found to carry moment while in the case of TbNi 4 Co, mainly Tb carries the moment. Magnetocaloric behavior has been investigated from the magnetization and the heat capacity measurements. The magnetic and magnetocaloric properties are found to be strongly correlated in these compounds.

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“…The temperature dependence of the magnetization M(T) of the Gd 0.4 Tb 0.6 Co 2 compound in zero-field cooling (ZFC) and field cooling (FC) modes at the external magnetic field of 0.1T is presented in Figure 2a. These thermomagnetic curves exhibit irreversible behavior in the low-temperature range, which often happens in this kind of compounds [10,24]. The magnetic ordering temperature T C estimated from the minimum value of dM/dT was equal to 300.7 K in both ZFC and FC modes.…”

Section: Magnetic and Magnetocaloric Propertiesmentioning

confidence: 90%

Magnetic Properties and the Electronic Structure of the Gd0.4Tb0.6Co2 Compound

et al. 2020

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We report on the comprehensive experimental and theoretical studies of magnetic and electronic structural properties of the Gd0.4Tb0.6Co2 compound crystallization in the cubic Laves phase (C15). We present new results and compare them to those reported earlier. The magnetic study was completed with electronic structure investigations. Based on magnetic isotherms, magnetic entropy change (ΔSM) was determined for many values of the magnetic field change (Δμ0H), which varied from 0.1 to 7 T. In each case, the ΔSM had a maximum around room temperature. The analysis of Arrott plots supplemented by a study of temperature dependency of Landau coefficients revealed that the compound undergoes a magnetic phase transition of the second type. From the M(T) dependency, the exchange integrals between rare-earth R-R (JRR), R-Co (JRCo), and Co-Co (JCoCo) atoms were evaluated within the mean-field theory approach. The electronic structure was determined using the X-ray photoelectron spectroscopy (XPS) method as well as by calculations using the density functional theory (DFT) based Full Potential Linearized Augmented Plane Waves (FP-LAPW) method. The comparison of results of ab initio calculations with the experimental data indicates that near TC the XPS spectrum collects excitations of electrons from Co3d states with different values of exchange splitting. The values of the magnetic moment on Co atoms determined from magnetic measurements, estimated from the XPS spectra, and results from ab initio calculations are quantitatively consistent.

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Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Cited by 17 publications

References 28 publications

Magnetocaloric effect and critical behavior near the paramagnetic to ferrimagnetic phase transition temperature inTbCo2−xFex

Magnetocaloric effect and critical behavior near the paramagnetic to ferrimagnetic phase transition temperature inTbCo2−xFex

Magnetic, magnetocaloric and neutron diffraction studies on TbNi5−xMx (M=Co and Fe) compounds

Magnetic Properties and the Electronic Structure of the Gd0.4Tb0.6Co2 Compound

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