Title :
Superconductivity in the iron-pnictide parent compound SrFe2As2
Author :
Kirshenbaum, Kevin C. ; Saha, Shanta R. ; Butch, Nicholas P. ; Magill, Jeffrey D. ; Paglione, Johnpierre
Author_Institution :
Center for Nanophysics & Adv. Mater., Univ. of Maryland, College Park, MD, USA
Abstract :
The appearance of superconductivity at ambient pressures in the undoped iron pnictide parent compound SrFe2As2 is studied experimentally using several techniques and approaches to aid in understanding the nature of this phase. Low temperature magnetization measurements of single crystals of SrFe2As2 reveal diamagnetic screening due to the onset of superconductivity below 21 K, with volume fraction estimates varying between 0 and 15%. The effects of heat treatment and cold-working via severe mechanical deformation on the superconducting phase found are studied, showing that superconductivity can be suppressed via modest annealing and reinstated by cold-working.
Keywords :
annealing; cold working; deformation; heat treatment; high-temperature superconductors; iron compounds; magnetic superconductors; magnetisation; strontium compounds; SrFe2As2; ambient pressures; cold-working; diamagnetic screening; heat treatment; iron-pnictide parent compound; low temperature magnetization measurements; mechanical deformation; modest annealing; single crystals; superconducting phase; superconductivity; volume fraction; Crystalline materials; Crystals; Doping; High temperature superconductors; Iron; Magnetic materials; Superconducting magnets; Superconducting materials; Superconducting transition temperature; Superconductivity; iron-pnictide; strain; superconductivity;
Conference_Titel :
Science and Technology for Humanity (TIC-STH), 2009 IEEE Toronto International Conference
Conference_Location :
Toronto, ON
Print_ISBN :
978-1-4244-3877-8
Electronic_ISBN :
978-1-4244-3878-5
DOI :
10.1109/TIC-STH.2009.5444377
