Fig. 1: Crystal structure and sample characterization of Hg-1223.
From: Unprecedentedly large gap in HgBa2Ca2Cu3O8+δ with the highest Tc at ambient pressure
a Crystal structure of Hg-1223 in which two outer planes (OPs) and one inner plane (IP) are contained in a unit cell. b Topography of the cleaved surface showing a single-unit-cell step. Setpoint condition: Vset = 1 V, Iset = 20 pA. c Height profile obtained along the orange arrow shown in (b). d Temperature dependence of in-plane resistivity measured at 0 T. The dashed straight line in (d) shows the linear extrapolation of the high-temperature resistive curve near the room temperature. The deviation temperature from the linear extrapolation and the experimental data is about 240 K, denoting the possible closing temperature of the pseudogap T*. e Temperature dependent magnetization measured in zero-field-cooled (ZFC) and field-cooled (FC) processes under a magnetic field of 10 Oe.
