MgTGe (T≡Mn, Fe) compounds of the CeFeSi-type. Magnetic structure of MgMnGe from neutron diffraction study

Welter, Richard; Malaman, B.; Venturini, G.

doi:10.1016/s0038-1098(98)00473-6

Cited by 22 publications

(11 citation statements)

References 18 publications

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“…Note that present results are in fair agreement with that reported in Ref. [3]: the Mn-X (XZGe,Si) distances play an important role in magnetic ordering of the rare earth intermetallic germanides and silicides.…”

Section: Discussionsupporting

confidence: 93%

“…The intermetallic RMnX compounds (R-rare earth, X-Ge or Ga) have been extensively studied in the past years [1][2][3][4][5][6][7][8][9]. These compounds, owing to the peculiarities of the crystallographic structures, characterizing by a layered arrangement of the Mn, R and Ge(Ga) ions and by the overlapping of the Ga(Ge) and Mn orbitals, demonstrate different types of magnetic ordering (ferrimagnetism, antiferromagnetism, canted antiferromagnetism).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ga substitution for Ge on magnetic and crystal properties of the GdMnGe1−x Gax intermetallics

et al. 2005

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effect of Ga substitution for Ge on magnetic and crystal properties of the GdMnGe1−x Gax intermetallics

et al. 2005

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“…The search for novel Fe-based SC has been naturally extended to systems in which the FeX layer contains group IV elements, in particular the non-toxic Ge. Thus, MgFeGe for example has been identified as isostructural and isoelectronic to the LiFeAs compound but displaying no superconductivity [7][8][9]. Evidence for superconductivity below 2 K has recently been reported in YFe 2 Ge 2 [10,11], although whether bulk superconductivity is actually realized in this material is currently under debate [12].…”

mentioning

confidence: 99%

Iron-based superconductivity extended to the novel silicide LaFeSiH

Bernardini¹,

Garbarino

Sulpice

et al. 2018

Phys. Rev. B

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We report the synthesis and characterization of the novel silicide LaFeSiH displaying superconductivity with onset at 11 K. We find that this pnictogen-free compound is isostructural to LaFeAsO, with a similar low-temperature tetragonal to orthorhombic distortion. Using density functional theory we show that this system is also a multiband metal in which the orthorhombic distortion is likely related to single-stripe antiferromagnetic order. Electrical resistivity and magnetic susceptibility measurements reveal that these features occur side-by-side with superconductivity, which is suppressed by external pressure.Iron-based superconductors (Fe-based SCs) provide an unprecedented playground for the investigation of high-T c superconductivity. These systems belong to a huge family of compounds and recurrently display the following key features (see e.g. [1,2] for recent reviews). From the structural point of view, they have FeX layers in which the Fe atoms form a square lattice that is sandwiched between two ( √ 2 × √ 2)R45 • shifted lattices of X (= P, As, Se, Te, S). This leads to a quasi-2D multiband Fermi surface that mainly originates from the Fe 3d orbitals. In addition, the parent compounds often display anti-ferromagnetic (AFM) order inducing a lattice distortion [3][4][5] that is generally pre-empted by the so-called nematic transition [2]. In the prototypical case of RFeAsO (R = rare earth), for example, this specifically corresponds to single-stripe AFM order [also called (π, 0) order] and a square-to-rectangular distortion of the Fe layers. These features advocate for the so-called s ± superconducting gap symmetry and a spin-fluctuation pairing. This superconductivity can be induced by carrier doping resulting from either chemical substitutions or physical pressure [6]. From a more methodological point of view, the electronic band structure and the magnetic orders found in Fe-based SC can be reasonably well described by means of DFT-based calculations as the electronic correlations often remain relatively weak.

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“…Magnetic interactions can be an important factor driving crystal structure formation and various structural distortions . Our spin‐polarized calculations (vide infra) provide evidence that the magnetic exchange in Li 2 MnGe is very strong, which appears to be a common feature for many Mn germanides …”

Section: Resultsmentioning

confidence: 69%

Studied and Forgotten. A Fresh Look at the Li–Mn–Ge System

Ovchinnikov

Bobev

2020

Zeitschrift anorg allge chemie

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The crystal structure of the ternary germanide Li2MnGe has been re‐evaluated from single‐crystal X‐ray diffraction data. This compound crystallizes in a non‐centrosymmetric superstructure of the ZrCuSiAs type (space group P4bm, Pearson code tP16), with the lattice parameters a = 6.088(4) Å, c = 6.323(4) Å. First‐principle calculations for the idealized structure predict antiferromagnetic exchange in the square Mn nets and semimetallic ground state. In addition, a new ternary phase with the composition Li2–xMn4+xGe5 (x ≈ 1.2) was discovered. It adopts the V6Si5 structure type (space group Ibam, Pearson code oI44), with the lattice parameters a = 7.570(2) Å, b = 16.323(3) Å, c = 5.057(1) Å. DSC/TG measurements show that this compound is thermally stable below 995 K.

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MgTGe (T≡Mn, Fe) compounds of the CeFeSi-type. Magnetic structure of MgMnGe from neutron diffraction study

Cited by 22 publications

References 18 publications

Effect of Ga substitution for Ge on magnetic and crystal properties of the GdMnGe1−x Gax intermetallics

Effect of Ga substitution for Ge on magnetic and crystal properties of the GdMnGe1−x Gax intermetallics

Iron-based superconductivity extended to the novel silicide LaFeSiH

Studied and Forgotten. A Fresh Look at the Li–Mn–Ge System

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