TY - GEN
T1 - Pressure studies for 1111 and 11 type iron-based superconductors
AU - Takahashi, Hiroki
AU - Okada, Hironari
AU - Takahashi, Hiroyuki
AU - Kamihara, Yoichi
AU - Matsuishi, Satoru
AU - Hirano, Masahiro
AU - Hosono, Hideo
AU - Mizuguch, Yoshikazu
AU - Takano, Yosihiko
PY - 2010
Y1 - 2010
N2 - In the recent development of the studies in iron-based superconductors, high-pressure experiments have been played an important role. Large enhancement of Tc with applying pressure and pressure-induced superconductivity were reported in LaFeAsO1-xFx. In this work, electrical, magnetic and structural measurements on 1111 type Ca(Fe1-xCo x)AsF and 11 type Fe(Se1-xTex)0.92 under high pressure have been performed. For Ca(Fe1-xCo x)AsF, the substitution of Co suppressed the magnetic and structural transitions and raised superconductivity. Pressure-induced superconductivity was observed for x = 0.0 and 0.05. The highest Tc was obtained in parent compound under high pressure, in contrast to LaFeAsO1-xF x. These results suggest that the substitution of Co increases carrier concentration and induces disorder in the FeAs superconducting layer. For FeTe0.92, pressure-induced superconductivity was not detected under high pressure up to 19 GPa, although the resistive anomaly due to the structural and magnetic phase transition was suppressed by applying pressure.
AB - In the recent development of the studies in iron-based superconductors, high-pressure experiments have been played an important role. Large enhancement of Tc with applying pressure and pressure-induced superconductivity were reported in LaFeAsO1-xFx. In this work, electrical, magnetic and structural measurements on 1111 type Ca(Fe1-xCo x)AsF and 11 type Fe(Se1-xTex)0.92 under high pressure have been performed. For Ca(Fe1-xCo x)AsF, the substitution of Co suppressed the magnetic and structural transitions and raised superconductivity. Pressure-induced superconductivity was observed for x = 0.0 and 0.05. The highest Tc was obtained in parent compound under high pressure, in contrast to LaFeAsO1-xF x. These results suggest that the substitution of Co increases carrier concentration and induces disorder in the FeAs superconducting layer. For FeTe0.92, pressure-induced superconductivity was not detected under high pressure up to 19 GPa, although the resistive anomaly due to the structural and magnetic phase transition was suppressed by applying pressure.
UR - https://www.scopus.com/pages/publications/84859052508
UR - https://www.scopus.com/pages/publications/84859052508#tab=citedBy
U2 - 10.1557/proc-1254-l02-02
DO - 10.1557/proc-1254-l02-02
M3 - Conference contribution
AN - SCOPUS:84859052508
SN - 9781618394903
T3 - Materials Research Society Symposium Proceedings
SP - 7
EP - 17
BT - Recent Advances and New Discoveries in High-Temperature Superconductivity
PB - Materials Research Society
T2 - 2010 MRS Spring Meeting
Y2 - 5 April 2010 through 9 April 2010
ER -