Heat capacity of Heusler alloys: Ferromagnetic Ni2MnSb, Ni2MnSn, NiMnSb and antiferromagnetic CuMnSb

Подгорных, С. М.; Streltsov, S. V.; Казанцев, В. А.; Shreder, E. I.

doi:10.1016/j.jmmm.2006.08.024

Cited by 27 publications

(11 citation statements)

References 12 publications

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“…9͑b͒. An anomalous T 2 temperature dependence in the specific heat was observed also in Pd 2 MnIn, 34 GdCu, 35 CuMnSb, 36 and CeNiSn. 37 It seems to be due to a sharp density of state ͑DOS͒ shape around E F , such as the V-shape density of states with small residual component at the Fermi level, as observed in the Kondo insulator CeNiSn.…”

Section: G Comparison With Paramagnetic Fe 2 Val In the Specific Heatmentioning

confidence: 77%

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

et al. 2010

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Weak itinerant ferromagnetism in Sato, K.; Naka, T.; Taguchi, M.; Nakane, T.; Ishikawa, F.; Yamada, Y.; Takaesu, Y.; Nakama, T.; de Visser, A.; Matsushita, A. Published in:Physical Review B DOI:10.1103/PhysRevB.82.104408 Link to publicationCitation for published version (APA): Sato, K., Naka, T., Taguchi, M., Nakane, T., Ishikawa, F., Yamada, Y., ... Matsushita, A. (2010 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We report measurements of the magnetic, transport, and thermal properties of the Heusler-type compound Fe 2 VAl 0.95 . We show that while stoichiometric Fe 2 VAl is a nonmagnetic semimetal a 5% substitution on the Al site with the 3d elements Fe and V atoms leads to a ferromagnetic ground state with a Curie temperature T C =33Ϯ 3 K and a small ordered moment s = 0.12 B / Fe in Fe 2 VAl 0.95 . The reduced value of the ratio s / p = 0.08, where p = 1.4 B / Fe is the effective Curie-Weiss moment, together with the analysis of the magnetization data M͑H , T͒, show magnetism is of itinerant nature. The specific heat shows an unusual temperature variation at low temperatures with an enhanced Sommerfeld coefficient, ␥ =12 mJ K −2 mol −1 . The resistivity, ͑T͒, is metallic and follows a power law behavior = 0 + AT n with n Ϸ 1.5 below T C . With applying pressure, T C decreases with the rate of ͑1 / T C ͒͑dT C / dP͒ = −0.061 GPa −1 . We conclude substitution on the Al site with Fe and V atoms results in itinerant ferromagnetism with a low carrier density.

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Section: G Comparison With Paramagnetic Fe 2 Val In the Specific Heatmentioning

confidence: 77%

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

et al. 2010

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“…According to Jeong et al, the antiferromagnetic phase may be pictured heuristically as self-doped Cu 1+ Mn 2+ Sb 3− and is characterized by a small, semimetallic density of states at the Fermi level with a finite minority band occupation. A large electron mass enhancement is predicted due to spin fluctuations while the hole masses are expected to stay normal [42,43].…”

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confidence: 96%

Canted antiferromagnetism in phase-pure CuMnSb

Regnat

Bauer

Senyshyn

et al. 2018

Phys. Rev. Materials

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We report the low-temperature properties of phase-pure single crystals of the half-Heusler compound CuMnSb grown by means of optical float-zoning. The magnetization, specific heat, electrical resistivity, and Hall effect of our single crystals exhibit an antiferromagnetic transition at TN = 55 K and a second anomaly at a temperature T * ≈ 34 K. Powder and single-crystal neutron diffraction establish an ordered magnetic moment of (3.9 ± 0.1) µB/f.u., consistent with the effective moment inferred from the Curie-Weiss dependence of the susceptibility. Below TN, the Mn sublattice displays commensurate type-II antiferromagnetic order with propagation vectors and magnetic moments along 111 (magnetic space group R[I]3c). Surprisingly, below T * , the moments tilt away from 111 by a finite angle δ ≈ 11 • , forming a canted antiferromagnetic structure without uniform magnetization consistent with magnetic space group C[B]c. Our results establish that type-II antiferromagnetism is not the zero-temperature magnetic ground state of CuMnSb as may be expected of the face-centered cubic Mn sublattice.

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“…This is because the Debye temperature of Mn 2 NiIn alloys have not been reported in literature and the value of 320K chosen for the present calculations is the one reported for Ni-Mn-Ga alloys. It must be mentioned here that the measured values of Debye temperature for isostructural Heusler alloys containing Mn is reported to lie between 220 K to 320 K [53] and hence the present choice of Debye temperature may not be far from the true value. Also the other extreme choice of 220K does not significantly affect the calculated spectra.…”

Section: Methodsmentioning

confidence: 82%

Effect of site occupancy disorder on martensitic properties of Mn2NiIn type alloys: X-ray absorption fine structure study

Lobo

Priolkar

Koide

et al. 2017

Journal of Applied Physics

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We have carried out ab-initio calculations of local structure of Mn and Ni in Mn2Ni1.5In0.5 alloy with different site occupancies in order to understand the similarities in martensitic and magnetic properties of Mn2Ni1+xIn1−x and Ni2Mn1 + xIn1−x alloys. Our results show that in Mn2Ni1+xIn1−x alloys there is a strong possibility of Mn atoms occupying all the three, X, Y and Z sites of X2YZ Heusler structure while Ni atoms preferentially occupy the X sites. Such a site occupancy disorder of Mn atoms is in addition to a local structural disorder due to size differences between Mn and In atoms which is also present in Ni2Mn1+xIn1−x alloys. Further, a comparison of the calculations with experimental XAFS at the Mn and Ni K edges in Mn2−yNi1.6+yIn0.4 (−0.08 ≤ y ≤ 0.08) indicate a strong connection between martensitic transformation and occupancy of Z sites by Mn atoms.

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Heat capacity of Heusler alloys: Ferromagnetic Ni2MnSb, Ni2MnSn, NiMnSb and antiferromagnetic CuMnSb

Cited by 27 publications

References 12 publications

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

Weak itinerant ferromagnetism in Heusler-typeFe2VAl0.95

Canted antiferromagnetism in phase-pure CuMnSb

Effect of site occupancy disorder on martensitic properties of Mn2NiIn type alloys: X-ray absorption fine structure study

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