Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal

Wang, Jingyuan; Farhang, Camron; Yue, Di; X, Jin; Zhu, Xiangde; Xia, Jianghai

doi:10.48550/arxiv.2208.10645

2022

DOI: 10.48550/arxiv.2208.10645

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Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal

Jingyuan Wang¹,

Camron Farhang²,

Di Yue³

et al.

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“…reports on the gap structures in the superconducting Bi/Ni bilayer: for example, chiral 𝑑 -wave superconductor 13,32 , and effective 𝑝-wave like superconductors [33][34][35][36][37] . Some of them suggested that the surface state of Bi/Ni bilayer is essential for unconventional superconductivity 13,32,35 .…”

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Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device

Niimi

Tokuda

Nakao

et al. 2023

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Topological superconductors are one of the intriguing material groups from the viewpoint of not only condensed matter physics but also elementally particle physics and industrial application such as quantum computers because of the existence of Majorana fermion that is its own antiparticle. For the realization of devices using Majorana fermion, developments of the thin film devices and novel functionalities are highly desirable. Bi/Ni bilayer is a possible candidate for thin-film chiral superconductors where the time-reversal symmetry is broken. Here we report the phase shift of Little-Parks oscillations by half flux quantum φ0/2 in a Bi/Ni ring-shaped device induced by a small magnetic field through the ring. The half quantum fluxoid can be a decisive evidence for unconventional superconductors where the superconducting order parameter has an internal degree of freedom. The present result demonstrates that Bi/Ni is a chiral superconductor with a spin triplet component, and that the internal degree of freedom plays an important role in the phase of supercurrent. The present work also provides a new operating principle for quantum devices where the phase of the supercurrent can be shifted by π with a small magnetic field, based on the internal degree of freedom possessed by topological superconductivity.

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Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device

Niimi

Tokuda

Nakao

et al. 2023

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Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal

Cited by 1 publication

References 0 publications

Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device

Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device

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