title: Pressure-induced superconductivity in Ba0.5Sr0.5Fe2As2.
abstract: High-pressure electrical resistance measurements have been performed on single crystal Ba(0.5)Sr(0.5)Fe(2)As(2)   platelets to pressures of 16 GPa and temperatures down to 10 K using designer diamond anvils under quasi-hydrostatic conditions with an insulating steatite pressure medium. The resistance measurements show evidence of pressure-induced superconductivity with an onset transition temperature at ∼31 K and zero resistance at ∼22 K for a pressure of 3.3 GPa. The transition temperature decreases gradually with increasing pressure before completely disappearing for pressures above 12 GPa. The present results provide experimental evidence that a solid solution of two 122-type materials,  i.e., Ba(1-x)Sr(x)Fe(2)As(2) (0 < x < 1), can also exhibit superconductivity under high pressure.
authors.affiliation: Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
authors.forename: Georgiy M
authors.initials: GM
authors.lastname: Tsoi
authors.forename: Walter
authors.initials: W
authors.lastname: Malone
authors.forename: Walter
authors.initials: W
authors.lastname: Uhoya
authors.forename: Jonathan E
authors.initials: JE
authors.lastname: Mitchell
authors.forename: Yogesh K
authors.initials: YK
authors.lastname: Vohra
authors.forename: Lowell E
authors.initials: LE
authors.lastname: Wenger
authors.forename: Athena S
authors.initials: AS
authors.lastname: Sefat
authors.forename: S T
authors.initials: ST
authors.lastname: Weir