Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)

Lin, Yan; Y., Wang, S.; Zhang, X.; Feng, Yang; Pan, Yinping; Ru, Hongqiang; Zhu, Jihang; Xiang, Boyuan; K., Liu,; Zheng, Chao; Wei, Liyang; Wang, M. X.; Liu, Z. K.; Chen, Lingxiao; Jiang, Kun; Guo, Yanfeng; Wang, Ziqiang; Wang, Y. H.

doi:10.1103/physrevx.13.011046

Phys. Rev. X

2023

DOI: 10.1103/physrevx.13.011046

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Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)

Yan Lin

Wang, S. Y.²,

X. Zhang³

et al.

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Cited by 7 publications

(2 citation statements)

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“…A superconductor (yellow) that contains isolated magnetic impurities (magnetic moments indicated by red arrows) can develop Yu-Shiba-Rusinov states (shaded regions). Lin and colleagues have shown that the superconductor Fe(Se,Te) (green) can form quantum anomalous vortices in the absence of an external magnetic field [1]. These structures consist of isolated Fe magnetic moments bordered by superconducting currents.…”

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confidence: 99%

“…Credit: APS/Alan Stonebraker system that can host such quasiparticles typically requires a strong magnetic field, which makes device integration tricky. Now Yishi Lin of Fudan University in China and colleagues have detected and manipulated structures called quantum anomalous vortices (QAVs) in the iron-based superconductor Fe(Se,Te) [1]. Remarkably, these structures form in the absence of a magnetic field and could theoretically support non-Abelian anyons known as Majorana zero modes [2].…”

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Superconducting Vortices Made Without Magnetic Fields

Banerjee

Robinson²

2023

Physics

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confidence: 99%

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confidence: 99%

Superconducting Vortices Made Without Magnetic Fields

Banerjee

Robinson²

2023

Physics

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Geometric Inhibition of Superflow in Single-Layer Graphene Suggests a Staggered-Flux Superconductivity in Bilayer and Trilayer Graphene

Zhang,

Jiang,

Shen

et al. 2024

Nano Lett.

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In great contrast to the numerous discoveries of superconductivity in layer-stacked graphene systems, the absence of superconductivity in the simplest monolayer graphene remains quite puzzling. Here, through realistic computation of the electronic structure, we identify a systematic trend that superconductivity emerges only upon alteration of the low-energy electronic lattice from the underlying honeycomb atomic structure. We then demonstrate that this inhibition can result from geometric frustration of the bond lattice that disables the quantum phase coherence of the order parameter residing on it. In comparison, upon deviation from the honeycomb lattice, relief of geometric frustration allows robust superfluidity with nontrivial spatial structures. For the specific examples of bilayer and trilayer graphene under an external electric field, such a bond-centered order parameter would develop superfluidity with staggered flux that breaks the time-reversal symmetry. Our study also suggests the possible realization of the long-sought superconductivity in single-layer graphene via the application of unidirectional strain.

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Revealing the vortex phases and second magnetization peaks in SmBCO superconductors

Shit,

Namburi,

Das

et al. 2024

Journal of Applied Physics

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Rare earth substitution in cuprate superconductors has sparked intense interest, driving progress in both fundamental research and advanced technology. In this investigation, we focus on SmBa2Cu3O7−δ (SmBCO), synthesized via the top-seeded melt growth method, with an aim to understand the corresponding vortex phases. Despite the minimal impact on transition temperature (Tc) when yttrium in YBa2Cu3O7−δ is replaced by Sm, the critical current density (Jc) remains exceptionally high under intense magnetic fields. Introducing Sm2Ba1Cu1O5 (Sm-211) phase as point defects significantly boosts the pinning potential (U) and pinning force (Fp) and enhances their stability against external magnetic fields. Contrary to other superconductors, the SmBCO sample displays a notable peak effect in the magnetic field-dependent Jc, driven by point defects introduced by the Sm-211 phase, which prompts vortex lattice softening and initiates a transition from an ordered to a disordered vortex glass phase, leading to the emergence of a second magnetization peak. Analysis suggests that the primary pinning mechanism in SmBCO involves a combination of normal point and Δκ pinning. Additionally, investigations of the vortex glass phase beneath the thermally activated flux flow regime indicate that vortices in SmBCO may freeze into a state akin to a 2D vortex glass state. This study leads to a detailed phase diagram that clarifies the evolution of vortex phases in SmBCO.

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Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)

Cited by 7 publications

References 56 publications

Superconducting Vortices Made Without Magnetic Fields

Superconducting Vortices Made Without Magnetic Fields

Geometric Inhibition of Superflow in Single-Layer Graphene Suggests a Staggered-Flux Superconductivity in Bilayer and Trilayer Graphene

Revealing the vortex phases and second magnetization peaks in SmBCO superconductors

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