[14a-P05-1~26] 11 Superconductivity (Poster)

[14a-P05-11] Evaluation of time-reversal symmetry in pseudogap of Bi₂Sr₂CaCu₂O_8+δ single crystals using generalized-high accuracy universal polarimeter

〇(B)Komei Okano¹, Kun Zhang¹, Keigo Tokita¹, Kenta Nakagawa², Takuya Nakanishi², Masaki Fujita³, Toru Asahi^1,2 (1.Faculty of Adv. Sci. & Eng., Waseda Univ., 2.Comprehensive Reserch Organization, Waseda Univ., 3.Institute for Materials Research, Tohoku Univ.)

Keywords:

superconductor,optical activity,birefringence

To verify the phase transition hypothesis in the pseudogap of Bi₂Sr₂CaCu₂O_8+δ (Bi2212), we have newly developed and constructed a generalized-high accuracy universal polarimeter (G-HAUP), which can be cooled at low-temperature, to evaluate whether the time-reversal symmetry of Bi2212 exists by measuring the reciprocal and non-reciprocal circular birefringence (CB), circular dichroism (CD) measurements. In this study, the measurement resolution of the newly constructed G-HAUP is quantitatively evaluated, and the existence or otherwise of the measured reciprocal and non-reciprocal CB・CD and time-reversal symmetry breaking is discussed from a quantitative point of view.