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Homogeneous Coexistence and Phase Segregation in 1111 Iron-based Pnictides Studied via NMR
Naoki Fujiwara,Yoichi Kamihara,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed 75As and 51Co nuclear magnetic resonance (NMR) measurements onLaFeAsO1−xFx (La1111), a prototype of iron-based superconductors, and on Ca(Fe1−xCox)AsF(Ca1111), which has a small overlap between the antiferromagnetic (AF) and superconducting(SC) domes in the electronic phase diagram. We found in the Ca1111 series that AF and SC statescoexist homogeneously in the overlapped region, while in the La1111 series, we found that paramagnetic(PM) and SC domains coexist around the AF-SC phase boundary. The coexistence of thesedomains indicates that the AF and SC domes segregate from each other in the electronic phasediagram.
Strong Enhancement of Superconductivity in Inorganic Electride 12CaO·7Al2O3:e− under High Pressure
Shigeki Tanaka,Tomoki Kato,Atsushi Miyake,Tomoko Kagayama,Katsuya Shimizu,Sung Wng Ki,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We present the results of the pressure dependence of the superconductivity of the inorganicelectride 12CaO·7Al2O3:e− (C12A7:e−) single crystal through the ac-susceptibility measurementunder high pressure. C12A7:e− has the cage structure and the density of states derived fromthe cages may play an important role in the superconductivity. The superconducting transitiontemperature (Tc) is 0.2 K at ambient pressure and monotonically increases up to 1.79 K at4.7 GPa. The upper critical field Hc2 and −dHc2/dT at Tc, in proportion to the density of states(DOS) at Fermi energy becomes larger under high pressure. The superconductivity in C12A7:e− ismediated by the electron-phonon interaction, and the increase of Tc with pressure may arise froma peak structure of the DOS of cage conduction band.