Chemical bonding in RFe6Ge4 (R = Li, Sc, Zr) and LuTi6Sn4 with rhombohedral LiFe6Ge4 type structure

Matar, Samir F.; Fickenscher, Thomas; Gerke, Birgit; Niehaus, Oliver; Rodewald, Ute Ch.; Alam, Adel F. Al; Ouaini, Naïm; Pöttgen, Rainer

doi:10.1016/j.solidstatesciences.2014.11.011

Cited by 8 publications

(7 citation statements)

References 31 publications

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“…The isomer shift is plotted in Fig. 5(b), where values similar to that found in ScFe 6 Ge 6 [46,47] are displayed. The isomer shift undergoes only small variation as it is cooled through T N , suggesting only minor changes to either the crystal or electronic structures with magnetic ordering.…”

Section: Resultssupporting

confidence: 53%

“…This small value of the hyperfine field in the magnetically ordered state is usually indicative of a small ordered magnetic moment. For example, it is much smaller than that found in ScFe 6 Ge 6 formed from the same elements [46,47]. This conclusion is at odds with the effective magnetic moment of ∼2.3 μ B found from fits to χ above T N , suggesting a difference between the ordered and fluctuating magnetic moments, as is common in weak itinerant magnets.…”

Section: Resultsmentioning

confidence: 76%

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Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe

Karna¹,

Tristant²,

Hebert³

et al. 2021

Phys. Rev. B

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An investigation of the structural, magnetic, thermodynamic, and charge transport properties of noncentrosymmetric hexagonal ScFeGe reveals it to be an anisotropic metal with a transition to a weak itinerant incommensurate helimagnetic state below T N = 36 K. Neutron diffraction measurements discovered a temperature and field independent helical wave vector k = (0 0 0.193) with magnetic moments of 0.53 μ B per Fe confined to the ab plane. Density functional theory calculations are consistent with these measurements and find several bands that cross the Fermi level along the c axis with a nearly degenerate set of flat bands just above the Fermi energy. The anisotropy found in the electrical transport is reflected in the calculated Fermi surface, which consists of several warped flat sheets along the c axis with two regions of significant nesting, one of which has a wave vector that closely matches that found in the neutron diffraction. The electronic structure calculations, along with a strong anomaly in the c-axis conductivity at T N , signal a Fermi surface driven magnetic transition, similar to that found in spin density wave materials. Magnetic fields applied in the ab plane result in a metamagnetic transition with a threshold field of ≈6.7 T along with a sharp, strongly temperature dependent discontinuity and a change in sign of the magnetoresistance for in-plane currents. Thus, ScFeGe is an ideal system to investigate the effect of in-plane magnetic fields on a helimagnet with a c-axis propagation vector, where the relative strength of the magnetic interactions and anisotropies determine the topology and magnetic structure.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 76%

Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe

Karna¹,

Tristant²,

Hebert³

et al. 2021

Phys. Rev. B

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“…These systems are all characterized by negligible solubility of the third component in the binary compounds and a low number of ternary compounds. Ternary compounds RTi 6 Sn 4 with ZrFe 6 Ge 4 -type structure have been found in the systems with R = Y, La-Nd, Sm, Gd-Tm, Lu [3,[8][9][10]20]. Comparing the isothermal section of the ternary system Ce-Ti-Sn at 600°C investigated here, with the section at 200°C determined earlier [2], one may note the increased complexity of the interactions between the components at the higher temperature, underlined by the formation of two ternary compounds, absent at 200°C.…”

Section: Isothermal Section Of the Phase Diagram Of The System Ce-ti-mentioning

confidence: 99%

“…This indicates that small homogeneity ranges probably exist. The chemical bonding in LuTi 6 Sn 4 and a series of isotypic germanides was studied based on DFT calculations in [20]. and is characterized by an ordered distribution of the atoms.…”

Section: The Ternary Compound Ceti 6 Snmentioning

confidence: 99%

Phase equilibria in the ternary system Ce–Ti–Sn at 600°C

Senchuk¹,

Tokaychuk²,

Demchenko³

et al. 2015

Chem. Met. Alloys

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The isothermal section of the phase diagram of the ternary system Ce-Ti-Sn was constructed in the whole concentration range at 600°C by means of X-ray powder diffraction. The binary compounds of the systems Ce-Sn and Ti-Sn dissolve negligible amounts of the third component. Two ternary compounds, CeTi 6 Sn 4 and ~Ce 3 TiSn 5 , were found. The crystal structure of the compound CeTi 6 Sn 4 belongs to the structure type ZrFe 6 Ge 4 (Pearson symbol hR33, space group R-3m, a = 5.8101(11), c = 22.971(5) Å). It completes the row of isotypic RTi 6 Sn 4 compounds with ZrFe 6 Ge 4-type structure (R = Y, LaNd , Sm, Gd-Tm, Lu).

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“…This small value of the hyperfine field in the magnetically ordered state is usually indicative of a small ordered magnetic moment. For example, it is much smaller than that found in ScFe 6 Ge 6 formed from the same elements 43,44 . This conclusion is at odds with the effective magnetic moment of ∼ 2.3µ B found from fits to χ above T N , suggesting a difference between the ordered and fluctuating magnetic moments, as is common in weak itinerant magnets.…”

Section: Resultsmentioning

confidence: 69%

Helical magnetic order and Fermi surface nesting in non-centrosymmetric ScFeGe

Karna,

Tristant,

Hebert

et al. 2020

Preprint

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An investigation of the structural, magnetic, thermodynamic, and charge transport properties of non-centrosymmetric hexagonal ScFeGe reveals it to be an anisotropic metal with a transition to a weak itinerant incommensurate helimagnetic state below TN = 36 K. Neutron diffraction measurements discovered a temperature and field independent helical wavevector k = (0 0 0.193) with magnetic moments of 0.53 µB per formula unit confined to the ab-plane. Density functional theory calculations are consistent with these measurements and find several bands that cross the Fermi level along the c-axis with a nearly degenerate set of flat bands just above the Fermi energy. The anisotropy found in the electrical transport is reflected in the calculated Fermi surface, which consists of several warped flat sheets along the c-axis with two regions of significant nesting, one of which has a wavevector that closely matches that found in the neutron diffraction. The electronic structure calculations, along with a strong anomaly in the c-axis conductivity at TN , signal a Fermi surface driven magnetic transition, similar to that found in spin density wave materials. Magnetic fields applied in the ab-plane result in a metamagnetic transition with a threshold field of ≈ 6.7 T along with a sharp, strongly temperature dependent, discontinuity and a change in sign of the magnetoresistance for in-plane currents. Thus, ScFeGe is an ideal system to investigate the effect of in-plane magnetic fields on an easy-plane magnetic system, where the relative strength of the magnetic interactions and anisotropies determine the topology and magnetic structure.

show abstract

Chemical bonding in RFe6Ge4 (R = Li, Sc, Zr) and LuTi6Sn4 with rhombohedral LiFe6Ge4 type structure

Cited by 8 publications

References 31 publications

Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe

Helical magnetic order and Fermi surface nesting in noncentrosymmetric ScFeGe

Phase equilibria in the ternary system Ce–Ti–Sn at 600°C

Helical magnetic order and Fermi surface nesting in non-centrosymmetric ScFeGe

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