Year: 2017
Type: article
Abstract: Discoveries of marked similarities to high-${T}_{\mathrm{c}}$ cuprate superconductors point to the realization of superconductivity in the doped ${J}_{\mathrm{eff}}=1/2$ Mott insulator ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$. Contrary to the mother compound of cuprate superconductors, several stacking patterns of in-plane canted antiferromagnetic moments have been reported, which are distinguished by the ferromagnetic components as $\ensuremath{-}++\ensuremath{-}$, $++++$, and $\ensuremath{-}+\ensuremath{-}+$. In this paper, we clarify unconventional features of the superconductivity coexisting with $\ensuremath{-}++\ensuremath{-}$ and $\ensuremath{-}+\ensuremath{-}+$ structures. Combining the group theoretical analysis and numerical calculations for an effective ${J}_{\mathrm{eff}}=1/2$ model, we show unusual superconducting gap structures in the $\ensuremath{-}++\ensuremath{-}$ state protected by nonsymmorphic magnetic space group symmetry. Furthermore, our calculation shows that the Fulde-Ferrell-Larkin-Ovchinnikov superconductivity is inevitably stabilized in the $\ensuremath{-}+\ensuremath{-}+$ state since the odd-parity magnetic $\ensuremath{-}+\ensuremath{-}+$ order makes the band structure asymmetric by cooperating with spin-orbit coupling. These unusual superconducting properties are signatures of magnetic multipole order in nonsymmorphic crystal.
Source: Physical Review Letters
Authors: Shuntaro Sumita, Takuya Nomoto, Youichi Yanase
Institution: Kyoto University
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2369834278, Magnetism, multipole order, and superconductivity in locally noncentrosymmetric crystals, 強相関・多自由度系超伝導体の微視的電子状態に基づいた理論研究, Understanding of the Mechanism of Superconductivity and Search for a Novel Superconducting State in Uranium Heavy-Fermion Compounds, G5325044368, Searching and understanding of exotic superconducting state induced by multipole order
OpenAlex ID: W2594578718