Spontaneous magnetic field and odd-frequency pairing state in multiband superconductors | Zendy

Yanyan Zhang | Zendy; Jia-Lin Chen | Zendy; Guo-Qiao Zha | Zendy; ShiPing Zhou | Zendy

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Spontaneous magnetic field and odd-frequency pairing state in multiband superconductors

Author(s) -

Yanyan Zhang,

Jia-Lin Chen,

Guo-Qiao Zha,

ShiPing Zhou

Publication year - 2019

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.68.20190445

Subject(s) - pairing , physics , condensed matter physics , parity (physics) , singlet state , superconductivity , t symmetry , triplet state , spin (aerodynamics) , phase diagram , coupling (piping) , quantum mechanics , phase (matter) , excited state , materials science , metallurgy , thermodynamics

We investigate the interband coupling induced odd-frequency pairing state by solving the microscopic Ginzburg-Landau model for the two band superconductor magnesium diboride (MgB 2 ). It is found that the interband coupling can induce a new domain structure and a heliacal spontaneous magnetic vortex-antivortex pair around the cyclical domain wall, which breaks down spin-rotational symmetry and supports a time-reversal violating bound state, allowing the coexistence of spin-singlet and spin-triplet state close to the spontaneous vortex core. The odd-frequency spin-triplet even parity pairing state occurs since a successive operation in the orbital parity (P) and the time-reversal (T) obeys PT = + 1(–1) for spin-singlet (spin-triplet) pairing amplitude. A general phase diagram is presented.

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