Coexistence of nontrivial topological properties and strong ferromagnetic fluctuations in quasi-one-dimensional A2Cr3As3

Xu, Chenchao; Wu, Nian; Zhi, Guoxiang; Lei, Bing‐Hua; Duan, Xu; Ning, Fanlong; Cao, Chao; Chen, Qijin

doi:10.1038/s41524-020-0294-9

Cited by 27 publications

(19 citation statements)

References 82 publications

(93 reference statements)

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“…In conclusion, our results clearly show that the compounds of the family A 2 Cr 3 As 3 (A= Na, K, Rb, Cs) are close to an interchain FM instability, which is significantly affected by structural effects. Our analysis can thus prove to be relevant in the study of the interplay between magnetism and superconductivity experimentally detected in this class of compounds [38,45].…”

Section: Discussionmentioning

confidence: 83%

Tuning interchain ferromagnetic instability in A2Cr3As3 ternary arsenides by chemical pressure and uniaxial strain

Cuono,

Forte,

Romano

et al. 2020

Preprint

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We analyze the effects of chemical pressure induced by alkali metal substitution and uniaxial strain on magnetism in the A2Cr3As3 (A = Na, K, Rb, Cs) family of ternary arsenides with quasi-one dimensional structure. Within the framework of the density functional theory, we predict that the non-magnetic phase is very close to a 3D collinear ferrimagnetic state, which realizes in the regime of moderate correlations, such tendency being common to all the members of the family with very small variations due to the different interchain ferromagnetic coupling. We uncover that the stability of such interchain ferromagnetic coupling has a non-monotonic behavior with increasing the cation size, being critically related to the degree of structural distortions which is parametrized by the Cr-As-Cr bonding angles along the chain direction. In particular, we demonstrate that it is boosted in the case of the Rb, in agreement with recent experiments. We also show that uniaxial strain is a viable tool to tune the non-magnetic phase towards an interchain ferromagnetic instability. The modification of the shape of the Cr triangles within the unit cell favors the formation of a net magnetization within the chain and of a ferromagnetic coupling among the chains. This study can provide relevant insights about the interplay between superconductivity and magnetism in this class of materials.

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Section: Discussionmentioning

confidence: 83%

Tuning interchain ferromagnetic instability in A2Cr3As3 ternary arsenides by chemical pressure and uniaxial strain

Cuono,

Forte,

Romano

et al. 2020

Preprint

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“…K 2 Cr 3 As 3 shows a weak ferromagnetic instability, consistent with experiments showing proximity to ferromagnetism. [13,44] In contrast, K 2 Mo 3 As 3 does not show any such instability. We also find an instability for distorted K 2 Cr 3 As 3 , but this is of ferrimagnetic nature where different Cr atoms in the reduced symmetry cell take different moments, mixing ferromagnetism and antiferromagnetism.…”

mentioning

confidence: 86%

“…This does not fully order, is affected by stoichiometry, including a tendency to take up H when K deficient, and does affect the magnetic, electronic and superconducting behavior. [38][39][40][41] This leads to wide variety of proposed electronic and superconducting states, including evidence for Tomonaga-Luttinger liquid physics, [42] spin-triplet superconductivity, [34,43] topological superconductivity [12,44] and nodal gap functions. [16,32,33,45] Here, we use first principles calculations to address the properties of K 2 Mo 3 As 3 .…”

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confidence: 99%

K2Mo3As3 is a Multi-Gap Electron-Phonon Superconductor

Lei,

Singh

2021

Preprint

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We show using density functional calculations that quasi-one-dimensional K2Mo3As3, which is closely related to the K2Cr3As3 and has very similar superconducting properties, is not close to magnetism and has conventional s-wave electron-phonon superconductivity. This superconductivity is of multi-gap character due to different coupling on different Fermi surface sheets. This is discussed in relation to the properties of this family of quasi-one-dimensional pnictide superconductors. The results show that this family of superconductors provides a unique opportunity for studying the interplay of spin-fluctuations and electron-phonon superconductivity in transition metal pnictides and offer a path for sorting out the different proposed superconducting scenarios in this fascinating family of pnictide superconductors.

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“…Earlier electronic structure calculations have shown that the low-energy properties are defined by a minimal three-band model, stemming mainly from the d z 2 , d xy , and d x 2 −y 2 orbitals of the Cr-atoms [39][40][41][42]. We adopt the three-band tight-binding model from Ref.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

$μ$SR study of unconventional pairing symmetry in the quasi-1D Na$_2$Cr$_3$As$_3$ superconductor

Bhattacharyya¹,

Adroja²,

Feng³

et al. 2021

Preprint

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We report the finding of a novel pairing state in a newly discovered superconductor Na 2 Cr 3 As 3 . This material has a noncentrosymmetric quasi-one-dimensional crystal structure and is superconducting at T C ∼ 8.0 K. We find that the magnetic penetration depth data suggests the presence of a nodal line p z -wave pairing state with zero magnetic moment using transverse-field muon-spin rotation (TF-µSR) measurements. The nodal gap observed in Na 2 Cr 3 As 3 compound is consistent with that observed in isostructural (K,Cs) 2 Cr 3 As 3 compounds using TF-µSR measurements. The observed pairing state is consistent with a three-band model spin-fluctuation calculation, which reveals the S z = 0 spin-triplet pairing state with the sin k z pairing symmetry. The long-sought search for chiral superconductivity with topological applications could be aided by such a novel triplet S z = 0 p-wave pairing state.

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Coexistence of nontrivial topological properties and strong ferromagnetic fluctuations in quasi-one-dimensional A2Cr3As3

Cited by 27 publications

References 82 publications

Tuning interchain ferromagnetic instability in A2Cr3As3 ternary arsenides by chemical pressure and uniaxial strain

Tuning interchain ferromagnetic instability in A2Cr3As3 ternary arsenides by chemical pressure and uniaxial strain

K2Mo3As3 is a Multi-Gap Electron-Phonon Superconductor

$μ$SR study of unconventional pairing symmetry in the quasi-1D Na$_2$Cr$_3$As$_3$ superconductor

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