Multigap superconductivity in centrosymmetric and noncentrosymmetric rhenium-boron superconductors

Shang, T.; Xie, Weiwei; Zhao, Jijun; Chen, Y.; Gawryluk, D. J.; Medarde, M.; Shi, M.; Yuan, Huiqiu; Pomjakushina, E.; Shiroka, T.

doi:10.1103/physrevb.103.184517

Cited by 21 publications

(33 citation statements)

References 62 publications

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“…We also obtained a variety of multiple-Q states while changing the model parameters systematically. The recent experiments indicate the rich multiple-Q states in centrosymmetric tetragonal magnets like GdRu 2 Si 2 [32,33,74], EuAl 4 [49][50][51]75], EuGa 4 [51,52], EuGa 2 Al 2 [53], and Mn 2−x Zn x Sb [54]. Our phase diagrams to cover the wide range of model parameters will be a reference to understand the microscopic origin of the experimental findings.…”

Section: Discussionmentioning

confidence: 94%

“…It was also demonstrated that the S-SkX appears in the ground state by considering the multiple-spin interaction arising from the spin-charge coupling in centrosymmetric itinerant magnets [46][47][48]. Simultaneously, the recent experimental studies indicate the emergence of the topological spin textures in the centrosymmetric tetragonal system in EuAl 4 [49][50][51], EuGa 4 [51,52], EuGa 2 Al 2 [53], and Mn 2−x Zn x Sb [54], which might host the S-SkX. Thus, it is highly desired to clarify the essence of the stabilization of the S-SkX at the microscopic level.…”

Section: Introductionmentioning

confidence: 92%

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Rectangular and square skyrmion crystals on a centrosymmetric square lattice with easy-axis anisotropy

Hayami

2022

Preprint

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We report our theoretical results on the emergence of rectangular-and square-shaped magnetic skyrmion crystals on a centrosymmetric square lattice with magnetic anisotropy. By performing the simulated annealing for a frustrated spin model with an easy-axis single-ion anisotropy on a square lattice, we find that a competition of the interactions in momentum space gives rise to the formation of two skyrmion crystals, where the skyrmion cores are aligned in a rectangle-or squarelattice way. Especially, the interactions at the higher harmonic wave vectors play an important role in stabilizing the square/rectangular skyrmion crystals. Our results provide a reference to explore further skyrmion-hosting materials in centrosymmetric tetragonal systems.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 92%

Rectangular and square skyrmion crystals on a centrosymmetric square lattice with easy-axis anisotropy

Hayami

2022

Preprint

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“…By contrast, TRS is preserved in the Re 1−x Mo x alloys for x > 0.12, independent of their centro-or noncentrosymmetric crystal structures [36]. Moreover, TRS is preserved in both centro-or noncentrosymmetric rhenium-boron superconductors [37]. All these results suggest that a noncentrosymmetric structure and thus the ASOC is not essential in realizing TRS breaking in Re-based superconductors, and its origins require further investigations.…”

Section: Introductionmentioning

confidence: 94%

NbReSi: A Noncentrosymetric Superconductor with Large Upper Critical Field

Su,

Shang,

et al. 2021

Preprint

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We report the discovery of superconductivity in noncentrosymmetric NbReSi, which crystallizes in a hexagonal ZrNiAl-type crystal structure with space group P 62m (No. 189). Bulk superconductivity, with Tc = 6.5 K was characterized via electrical-resistivity, magnetization, and heat-capacity measurements. The low-temperature electronic specific heat suggests a fully gapped superconducting state in NbReSi, while a large upper critical field of µ0Hc2(0) ∼ 12.6 T is obtained, which is comparable to the weak-coupling Pauli limit. The electronic band-structure calculations show that the density of states at the Fermi level are dominated by Re and Nb d-orbitals, with a sizeable band splitting induced by the antisymmetric spin-orbit coupling. NbReSi represents another candidate material for revealing the puzzle of time-reversal symmetry breaking observed in some Re-based superconductors and its relation to the lack of inversion symmetry.

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“…However, there are additional observations that complicate this discussion. A linear dependence between the nuclear magnetic moment and the internal magnetic fields generated in the superconducting state for rhenium-based superconductors has been proposed [38], which includes Re 3 W [41] and recently reported Re 3 B and Re 7 B 3 [42,43]. But despite having a nuclear moment of approximately 3 nuclear magnetons, TRS is preserved in Re 3 Ta [44], and so does not follow this trend.…”

Section: Introductionmentioning

confidence: 99%

Quantum muon diffusion and the preservation of time-reversal symmetry in the superconducting state of type-I rhenium

et al. 2022

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Elemental rhenium exhibiting type-II superconductivity has been previously reported to break time-reversal symmetry in the superconducting state. We have investigated an arc-melted sample of rhenium exhibiting type-I superconductivity. Low-temperature zero-field muon-spin relaxation measurements indicate that time-reversal symmetry is preserved in the superconducting state. Muon diffusion is observed, which is due to quantum mechanical tunneling between interstitial sites. The normal state behavior is characterized by the conduction electrons screening the muons and thermal broadening, and is typical for a metal. Energy asymmetries between muon trapping sites and the superconducting energy gap also characterize the superconducting state behavior.

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Multigap superconductivity in centrosymmetric and noncentrosymmetric rhenium-boron superconductors

Cited by 21 publications

References 62 publications

Rectangular and square skyrmion crystals on a centrosymmetric square lattice with easy-axis anisotropy

Rectangular and square skyrmion crystals on a centrosymmetric square lattice with easy-axis anisotropy

NbReSi: A Noncentrosymetric Superconductor with Large Upper Critical Field

Quantum muon diffusion and the preservation of time-reversal symmetry in the superconducting state of type-I rhenium

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