Structural chirality of 
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-Mn

Lovesey, S. W.

doi:10.1103/physrevb.103.155136

Cited by 5 publications

(2 citation statements)

References 45 publications

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“…Introductory material is available in [23,[44][45][46][47]. Our axial and polar multipoles are denoted by ⟨t K ⟩, and ⟨u K ⟩ and ⟨g K ⟩, respectively.…”

Section: Resonant X-ray Bragg Diffractionmentioning

confidence: 99%

Polar magnetism and chemical bond in α-RuCl₃

Lovesey

2023

J. Phys.: Condens. Matter

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The micaceous black allotrope of ruthenium trichloride is the subject of many recent experimental and theoretical studies. Johnson et al. infer a candidate for the magnetic structure (Cc2/m) from results gathered in an extensive set of experiments on an untwined sample of α-RuCl3 [Phys. Rev. B 92, 235119 (2015)]. The proposed zigzag antiferromagnetic ground state of Ru ions does not respond to bulk magnetic probes, with optical rotation and all forms of dichroism prohibited by symmetry. Experimental techniques exploited by Johnson et al. included x-ray and magnetic neutron diffraction. Properties of the candidate magnetic structure not previously explored include polar magnetism. In a general case, anapoles are capable of generating interactions between magnetic ions, as in an electrical Dzyaloshinskii-Moryia interaction [T. A. Kaplan and S. D. Mahanti, Phys. Rev. B 83, 174432 (2011) and H. J. Zhao et al., Nat. Mat. 20, 341 (2021)]. From symmetry-informed calculations we show that, the magnetic candidate permits Bragg spots that arise solely from Dirac multipoles. Stringent tests of Cc2/m can also be accomplished by performing resonant x-ray diffraction with signal enhancement from the chlorine K-edge. X-ray absorption spectra published for α-RuCl3 possess a significant low-energy feature [K. W. Plumb et al., Phys. Rev. B 90, 041112(R) (2014)]. Many experimental studies of other Cl-metal compounds concluded that identical features hallmark the chemical bond. Using a monoclinic Cc2/m structure, we predict the contribution to Bragg diffraction at the Cl K-edge absorption. Specifically, the variation of intensity of Bragg spots with rotation of the sample about the reflection vector. The two principal topics of our studies, polar magnetism and the chemical bond in α-RuCl3, are brought together in a minimal model of magnetic Ru ions in Cc2/m.

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“…Introductory material is available in [23,[44][45][46][47]. Our axial and polar multipoles are denoted by ⟨t K ⟩, and ⟨u K ⟩ and ⟨g K ⟩, respectively.…”

Section: Resonant X-ray Bragg Diffractionmentioning

confidence: 99%

Polar magnetism and chemical bond in α-RuCl₃

Lovesey

2023

J. Phys.: Condens. Matter

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“…The cubic β-Mn type NCSs crystalline in a pair of enantiomorphic space groups, P 4 1 32 and P 4 3 32, and hence are not only noncentrosymmetric but also chiral. [17] These NCSs have attracted much attention since the observation of a spin-triplet pairing component in Li 2 Pt 3 B. [18] This contrasts with the case of isostructural Li 2 Pd 3 B, where a spin-singlet pairing is dominant.…”

Section: Introductionmentioning

confidence: 99%

Mo$_{3}$ReRuC: A noncentrosymmetric superconductor formed in the MoReRu-Mo$_{2}$C system

Zhu,

Xiao,

Yang

et al. 2023

Preprint

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A quaternary compound with the composition Mo3ReRuC is obtained in a previously unexplored MoReRu-Mo2C system. According to x-ray structural analysis, Mo3ReRuC crystallizes in the noncentrosymmetric space group P 4132 (cubic β-Mn type structure, a = 6.8107(1) Å). Below 7.7 K, Mo3ReRuC becomes a bulk type-II superconductor with an upper critical field close to the Pauli paramagnetic limit. The specific heat data gives a large normalized jump ∆Cp/γTc = 2.3 at Tc, which points to a strongly coupled superconducting state. First principles calculations show that its electronic states at the Fermi level are mainly contributed by Mo, Re and Ru atoms and strongly increased by the spin-orbit coupling. Our finding suggests that the intermediate phase between alloys and carbides may be a good place to look for β-Mn type noncentrosymmetric superconductors.

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