Presentation Information
[PC4-01-INV]Chiral Superconductivity in the Layered Pnictide BaPtAs1–xSbx with a Honeycomb Network
*Tadashi Adachi1 (1. Department of Engineering and Applied Sciences, Sophia University (Japan))
Keywords:
Chiral Superconductivity,Muon Spin Relaxation,Honeycomb Network,Layered Pnictide
Chiral superconductivity is a new class of superconducting (SC) state that has attracted much attention over the past decade. In a chiral SC state, the orbital motion of SC electron pairs creates a spontaneous magnetic field, which is a manifestation of broken time-reversal symmetry. For the chiral d-wave superconductivity with spin-singlet pairing, muon-spin-relaxation (μSR) measurements in the layered pnictide SrPtAs with a honeycomb network revealed the development of a weak internal magnetic field below the SC transition temperature Tc, suggesting the occurrence of a spontaneous magnetic field caused by the breaking of the time-reversal symmetry [1]. To investigate the possible chiral d-wave state, we performed mSR measurements on another layered pnictide, BaPtAs1–xSbx (x = 0.2, 0.9, 1.0), which also has a honeycomb network [2,3]. Possible chiral SC states were theoretically proposed for x = 1.0 [4]. Zero-field μSR revealed that, while the relaxation rate of muon spins, λ, is almost temperature-independent for x = 0.2 and 0.9, λ gradually increases with decreasing temperature below Tc = 1.6 K for x = 1.0. These results suggest that an internal magnetic field corresponding to the spontaneous magnetic field develops at x = 1.0. It is also suggested that the disorder induced by As substitution destroys the chiral SC state, and that the observed chiral SC state at x = 1.0 is probably a d-wave one [5].
This work was performed in collaboration with C. Bains, J. Goryo, M. Hagiwara, W. Higemoto, Y. Imai, T. Imazu, T. U. Ito, R. Kadono, K. Kawabata, T. Kida, A. Koda, Y. Komiyama, K. Kudo, K. Manabe, K. Mano, Y. Nagakubo, J. G. Nakamura, M. Nohara, T. Ogawa, H. Okabe, Y. Saito, T. Sumura, T. Takeuchi, I. Watanabe
References
1) P. K. Biswas et al. Phys. Rev. B Vol.87, p180503(R), 2013
2) K. Kudo et al. J. Phys. Soc. Jpn. Vol.87, p063702, 2018
3) T. Ogawa et al. J. Phys. Soc. Jpn. Vol.91, p123702, 2022
4) M. Kudo et al. J. Phys.: Conf. Series Vol.2164, p0121015, 2020
5) T. Adachi et al. Phys. Rev. B Vol.111, pL100508, 2025
This work was performed in collaboration with C. Bains, J. Goryo, M. Hagiwara, W. Higemoto, Y. Imai, T. Imazu, T. U. Ito, R. Kadono, K. Kawabata, T. Kida, A. Koda, Y. Komiyama, K. Kudo, K. Manabe, K. Mano, Y. Nagakubo, J. G. Nakamura, M. Nohara, T. Ogawa, H. Okabe, Y. Saito, T. Sumura, T. Takeuchi, I. Watanabe
References
1) P. K. Biswas et al. Phys. Rev. B Vol.87, p180503(R), 2013
2) K. Kudo et al. J. Phys. Soc. Jpn. Vol.87, p063702, 2018
3) T. Ogawa et al. J. Phys. Soc. Jpn. Vol.91, p123702, 2022
4) M. Kudo et al. J. Phys.: Conf. Series Vol.2164, p0121015, 2020
5) T. Adachi et al. Phys. Rev. B Vol.111, pL100508, 2025