- 6月20日 (水), 13:30-
- 京都大学理学部 5号館 413
- Dr. Jun Ishizuka
- (Condensed Matter Theory Group)
- "Magnetic multipole fluctuation and superconductivity in locally noncentrosymmetric crystal"
Abstract: Recent intensive research in locally noncenrosymmetric (NCS) crystals has revealed that odd-parity multipole order would be realized in several materials, such as BaMn2As2 , Sr2IrO4 , Cd2Re2O7 , and SrTiO3 . These materials have been studied from the view point of the odd-parity multipole. Superconductivity near the odd-parity electromagnetic multipole order may invokes an unconventional pairing mechanism induced by an odd-parity multipole fluctuation. Intriguingly, because the antiferromagnetic (AFM) order in locally NCS crystals with the sublattice-dependent antisymmetric spin-orbit coupling (ASOC) stabilizes the odd-parity multipole order, AFM-fluctuation-induced superconductivity will naturally reveal the superconductivity owing to the odd-parity fluctuation. However, theoretical studies based on microscopic models have not been conducted, except for a few works . Here, we study a microscopic model and show that two odd-parity superconductivities are realized near the parity-violating magnetic order. Reference:  H. Watanabe and Y. Yanase, Phys. Rev. B 96, 064432 (2017).  L. Zhao et al, Nat. Phys. 12, 32 (2016).  L. Fu, Phys. Rev. Lett. 115, 026401 (2015).  C. W. Rischau et al, Nat. Phys. 13, 643 (2017).  V. Kozii and L. Fu Phys. Rev. Lett 115, 207002 (2015).