Crystal structures of PrAlxGe2−x compounds

In magnetic Weyl semimetals, where magnetism breaks time-reversal symmetry, large magnetically sensitive anomalous transport responses are anticipated that could be useful for topological spintronics. The identification of new magnetic Weyl semimetals is therefore in high demand, particularly since in these systems Weyl node configurations may be easily modified using magnetic fields. Here we explore experimentally the magnetic semimetal PrAlGe, and unveil a direct correspondence between easy-axis Pr ferromagnetism and anomalous Hall and Nernst effects. With sizes of both the anomalous Hall conductivity and Nernst effect in good quantitative agreement with first principles calculations, we identify PrAlGe as a system where magnetic fields can connect directly to Weyl nodes via the Pr magnetisation. Furthermore, we find the predominantly easy-axis ferromagnetic ground state coexists with a low density of nanoscale textured magnetic domain walls. We describe how such nanoscale magnetic textures could serve as a local platform for tunable axial gauge fields of Weyl fermions.

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“…109). 66 Arrows indicate localised magnetic Pr moments aligned with the c-axis. Image made using VESTA.…”

Section: Neutron Scatteringmentioning

confidence: 99%

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields

et al. 2020

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“…Effects such as ternary solid solubility and the existence of low and high-temperature modifications complicate the structural analysis even further. Some classifications and systematic studies of equiatomic RAlSi [8] and RAlGe [8,12,32] have already been published. These structural data on ''on-stoichiometry'' prepared compounds establish that when R is a small rare-earth (Tb-Lu), the corresponding RAlSi and RAlGe compounds crystallize with the orthorhombic YAlGe-type [8,12].…”

Section: Phase Equilibriamentioning

confidence: 99%

Ternary rare-earth alumo-silicides—single-crystal growth from Al flux, structural and physical properties

Bobev

Tobash

Fritsch

et al. 2005

Journal of Solid State Chemistry

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“…As we have shown here, the low-energy band structures of LaAlGe, CeAlGe and PrAlGe realize the I-breaking type-II, the T -breaking type-II, and the T -breaking type-I Weyl fermions. Moreover, n (electron) doping can be achieved by changing the ratio between Al and Ge, i.e., RAl 1−x Ge 1+x [60].…”

Section: (C)mentioning

confidence: 99%

“…The generalized gradient approximation (GGA) [71] was used for the exchange-correlation effect and the Hubbard energy U used in the calculation is 4 eV. The lattice constants of RAlX were acquired from previous experimental measurements [58][59][60].…”

Section: (C)mentioning

confidence: 99%

“…Here, we propose a new strategy to search for magnetic Weyl semimetals. Taking advantage of the Weyl nodes generated by inversion-symmetry breaking in the nonmagnetic compound LaAlGe [44,58], we present a new type of magnetic Weyl semimetal in its iso-structural sister compounds CeAlGe and PrAlGe [59,60] that are ferromagnetic [61][62][63]. We show that the ferromagnetism in RAlGe can be more reliably modeled in first-principles calculation as it is found to not completely change the band structure.…”

mentioning

confidence: 99%

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Magnetic and noncentrosymmetric Weyl fermion semimetals in the RAlGe family of compounds ( R=rareearth
Chang
¹
,
Singh
²
,
Xu
³

et al. 2018
Phys. Rev. B
176
3
102
0
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Weyl semimetals are novel topological conductors that host Weyl fermions as emergent quasiparticles. In this paper, we propose a new type of Weyl semimetal state that breaks both time-reversal symmetry and inversion-symmetry in the RAlGe (R=Rare earth) family. Compared to previous predictions of magnetic Weyl semimetal candidates, the prediction of Weyl nodes in RAlGe are more robust and less dependent on the details of the magnetism, because the Weyl nodes are already generated by the inversion breaking and the ferromagnetism acts as a simple Zeeman coupling that shifts the Weyl nodes in k space. Moreover, RAlGe offers remarkable tunability, which covers all varieties of Weyl semimetals including type-I, type-II, inversion-breaking and time-reversal breaking, depending on a suitable choice of the rare earth elements. Further, the unique noncentrosymmetric and ferromagnetic Weyl semimetal state in RAlGe enables the generation of spin-currents.

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Crystal structures of PrAlxGe2−x compounds

Cited by 18 publications

References 9 publications

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields

Ternary rare-earth alumo-silicides—single-crystal growth from Al flux, structural and physical properties

Magnetic and noncentrosymmetric Weyl fermion semimetals in the RAlGe family of compounds ( R=rareearth
Chang
¹
,
Singh
²
,
Xu
³

et al. 2018
Phys. Rev. B
176
3
102
0
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Crystal structures of PrAlxGe2−x compounds

Cited by 18 publications

References 9 publications

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields

Ternary rare-earth alumo-silicides—single-crystal growth from Al flux, structural and physical properties

Magnetic and noncentrosymmetric Weyl fermion semimetals in the RAlGe family of compounds ( R=rareearthChang1, Singh2, Xu3 et al. 2018Phys. Rev. B17631020View full textAdd to dashboardCite

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Magnetic and noncentrosymmetric Weyl fermion semimetals in the RAlGe family of compounds ( R=rareearth
Chang
¹
,
Singh
²
,
Xu
³

et al. 2018
Phys. Rev. B
176
3
102
0
View full text Add to dashboard Cite