title: High pressure superconductivity in iron-based layered compounds studied using designer diamonds.
abstract: High pressure superconductivity in iron-based superconductor FeSe(0.5)Te(0.5) has been studied up to 15 GPa and 10 K using an eight probe designer diamond anvil in a diamond anvil cell device. Four probe electrical resistance measurements show the onset of superconductivity (T(c)) at 14 K at ambient pressure with T(c) increasing with increasing pressure to 19 K at a pressure of 3.6 GPa. At higher pressures beyond 3.6 GPa, T(c) decreases and extrapolation suggests non-superconducting behavior above 10 GPa. The loss of superconductivity coincides with the pressure induced disordering of the Fe(SeTe)(4) tetrahedra reported at 11 GPa in x-ray diffraction studies at ambient temperature.
authors.affiliation: Department of Physics, University of Alabama at Birmingham (UAB), Birmingham, AL 35294, USA.
authors.forename: Georgiy
authors.initials: G
authors.lastname: Tsoi
authors.forename: Andrew K
authors.initials: AK
authors.lastname: Stemshorn
authors.forename: Yogesh K
authors.initials: YK
authors.lastname: Vohra
authors.forename: Phillip M
authors.initials: PM
authors.lastname: Wu
authors.forename: F C
authors.initials: FC
authors.lastname: Hsu
authors.forename: Y L
authors.initials: YL
authors.lastname: Huang
authors.forename: M K
authors.initials: MK
authors.lastname: Wu
authors.forename: K W
authors.initials: KW
authors.lastname: Yeh
authors.forename: Samuel T
authors.initials: ST
authors.lastname: Weir