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arXiv · 1807.05707

Odd-parity multipole fluctuation and unconventional superconductivity in locally noncentrosymmetric crystal

Jun Ishizuka·Youichi Yanase
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Abstract

A microscopic calculation and symmetry argument reveal superconductivity in the vicinity of parity-violating magnetic order. An augmented cluster magnetic multipole order in a crystal lacking local space inversion parity may break global inversion symmetry, and then, it is classified into an odd-parity multipole order. We investigate unconventional superconductivity induced by an odd-parity magnetic multipole fluctuation in a two-dimensional two-sublattice Hubbard model motivated by Sr$_2$IrO$_4$. We find that even-parity superconductivity is more significantly suppressed by a spin-orbit coupling than that in a globally noncentrosymmetric system. Consequently, two odd-parity superconducting states are stabilized by magnetic multipole fluctuations in a large spin-orbit coupling region. Both of them are identified as $Z_2$ topological superconducting states. The obtained gap function of inter-sublattice pairing shows a gapped/nodal structure protected by nonsymmorphic symmetry. Our finding implies a new family of odd-parity topological superconductors. Candidate materials are discussed.

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Jun Ishizuka, Youichi Yanase. 2018-07-16. Odd-parity multipole fluctuation and unconventional superconductivity in locally noncentrosymmetric crystal. https://doi.org/10.1103/physrevb.98.224510

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