We have measured the field-cooled (fc) and zero-field-cooled (zfc) magnetizations of 110°C annealed La2CuO4+δ for 0 <δ< 0.12. We found that the Meissner signals (fc magnetizations) and shielding signals (zfc magnetizations) are almost right on top of each other except at very low temperatures close to 5 K. In particular, at 6 = 0.03, an anomalously large irreversible magnetization at low temperatures and unusual paramagnetic signals are observed at Tc. We suggest that the observed anomalies are intrinsic and are electronic in origin which is closely related to the existence of a critical hole concentration at Pc ≅ 0.06.
為了持續優化網站功能與使用者體驗,本網站將Cookies分析技術用於網站營運、分析和個人化服務之目的。
若您繼續瀏覽本網站,即表示您同意本網站使用Cookies。