First-order ferromagnetic transitions of lanthanide local moments in divalent compounds: An itinerant electron positive feedback mechanism and Fermi surface topological change

Mendive-Tapia, Eduardo; Paudyal, Durga; Petit, L.; Staunton, J. B.

doi:10.1103/physrevb.101.174437

Cited by 19 publications

(14 citation statements)

References 46 publications

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“…We note that the electronic mechanism of Ref. [24] describing the anhysteretic behavior of Eu 2 In confirms this scenario as well. Here, the Fermi energy E F is located near the top of Eu 5d and In 5p bands, which plays an important role in determining how interactions between the localized Eu 2+ 4 f moments are mediated by the hybridized Eu 5d and In 5p states [24].…”

Section: Resultssupporting

confidence: 78%

“…[24] describing the anhysteretic behavior of Eu 2 In confirms this scenario as well. Here, the Fermi energy E F is located near the top of Eu 5d and In 5p bands, which plays an important role in determining how interactions between the localized Eu 2+ 4 f moments are mediated by the hybridized Eu 5d and In 5p states [24]. When E F is located near the top or the bottom of a band, the density of states at E F becomes strongly dependent on magnetic moments, and this dependence strengthens (or weakens) the indirect magnetic exchange interactions, thus…”

Section: Resultssupporting

confidence: 73%

“…In agreement with the band structure described in [22], a purely electronic mechanism associating the anhysteretic behavior of Eu 2 In with Fermi-surface topology changes triggered by spin polarization has been recently proposed [24]. Here we investigate the anhysteretic character of the FOMT in Eu 2 In through the analysis of the magnetic free-energy landscape derived using a model Hamiltonian that takes into account magnetic exchange and magnetoelastic interactions.…”

Section: Introductionsupporting

confidence: 64%

“…driving the FM↔PM transition in Eu 2 In without hysteresis [24]. The changes in the Eu 4 f exchange interactions derived explicitly from first principles in [24] are included implicitly in our phenomenological model through the magnetoelastic parameter.…”

Section: Fig 2 Magnetization Of Eumentioning

confidence: 99%

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Free-energy analysis of the nonhysteretic first-order phase transition of Eu2In

et al. 2020

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Binary intermetallic Eu2In was recently reported to exhibit a giant anhysteretic magnetocaloric effect due to a first-order magnetic phase transition between paramagnetic and ferromagnetic states. Experimentally, the transition occurs with a small phase volume change, ΔV/V, of approximately 0.1% around TC of ca. 55 K. We represent magnetic and compute magnetocaloric properties of a Eu2In compound using a microscopic description based on a model Hamiltonian that takes into account magnetic exchange and magnetoelastic interactions. In the model the thermodynamic nature of the transition is conveniently represented by a single magnetoelastic interaction parameter. A good agreement between the theoretical results and earlier published experimental data confirms the effectiveness of our approach.

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Section: Resultssupporting

confidence: 78%

Section: Resultssupporting

confidence: 73%

Section: Introductionsupporting

confidence: 64%

Section: Fig 2 Magnetization Of Eumentioning

confidence: 99%

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Free-energy analysis of the nonhysteretic first-order phase transition of Eu2In

et al. 2020

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“…(Eu 2 In)], which is slightly larger than that expected for Eu 2+ (14 μ B /f.u.) [9,33]. Besides, a possible change in the structural contribution to the heat capacity at the ferromagnetic transition was neglected.…”

Section: B "Nonmagnetic" Yb 2 In As An Isostructural Reference For Rmentioning

confidence: 99%

Crystal structure and physical properties of Yb2In and Eu2−xYbxIn all

Guillou

Yibole

Hamane

et al. 2020

Phys. Rev. Materials

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While binary RE2In, where RE = rare earth, have been reported a few decades ago, recent investigations revealed intriguing new physical insights. For instance, the discovery of a nearly ideal first-order ferromagnetic transition in Eu2In calls for further exploration of structures and properties of RE2In, in particular for the least-documented RE = Eu and Yb cases. Here, we investigate Eu2-xYbxIn pseudobinaries with nominal values of x = 0.25, 0.5, 0.75, 1, 1.5, 2 by powder x-ray diffraction (including as function of temperature from 100 to 375 K for Yb2In), magnetization (5-300 K), as well as electrical resistivity (5-300 K) and calorimetric (2150 K) measurements for Yb2In. Compared to other RE, Yb or Eu always raise challenging questions linked to their valence states. From average atomic volume, Yb is anticipated to be divalent in Yb2In, at least between 100 and 375 K, which is in line with the absence of 4f magnetism. In agreement with x-ray diffraction and magnetization data, the resistivity of Yb2In is rather featureless and typical of a metal. Establishing Yb2In as a nonmagnetic isostructural reference for Eu2In allows one to use its heat capacity to revisit that of the latter, and get experimental insights into the exceptional magnetocaloric effect of the compound with Eu. In particular, we show that a third of the total magnetic entropy (S-m approximate to 35.6 J mol(-1) K-1 at T = 100 K) is concentrated in a 3 K temperature window around the T-C of Eu2In. Starting from the ferromagnetic compound Eu2In [T-C = 55.2(5) K], we show that Yb substitutions in Eu2-xYbxIn lead to a decrease in both the Curie temperature [T-C = 41(2) and 32(2) K for x = 0.25 and 0.5] and magnetic saturation, while weakening the first-order character of the transition as x increases. A significant isothermal entropy change of 5.1(4) J mol(-1) K-1 for Delta B = 2 T is found at 44 K in Eu1.75Yb0.25In, demonstrating that the giant magnetocaloric effect of Eu2In can be tuned to lower temperatures by Yb substitutions.

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Magnetic and magnetocaloric properties of Tb1.4Dy0.6In compound

U. D,

et al. 2024

Journal of Alloys and Compounds

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First-order ferromagnetic transitions of lanthanide local moments in divalent compounds: An itinerant electron positive feedback mechanism and Fermi surface topological change

Cited by 19 publications

References 46 publications

Free-energy analysis of the nonhysteretic first-order phase transition of Eu2In

Free-energy analysis of the nonhysteretic first-order phase transition of Eu2In

Crystal structure and physical properties of Yb2In and Eu2−xYbxIn all

Magnetic and magnetocaloric properties of Tb1.4Dy0.6In compound

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