Pressure induced superconductivity in CaFe2As2

TitlePressure induced superconductivity in CaFe2As2
Publication TypeJournal Article
Year of Publication2008
AuthorsTorikachvili MS, Bud'ko SL, Ni N, Canfield PC
Journal TitlePhysical Review Letters
Date PublishedAug
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000258384700050

CaFe2As2 has been found to be exceptionally sensitive to the application of hydrostatic pressure and can be tuned to reveal all the salient features associated with FeAs superconductivity without introducing any disorder. The ambient pressure, 170 K, structural/magnetic, first-order phase transition is suppressed to 128 K by 3.5 kbar. At 5.5 kbar a new transition is detected at 104 K, increasing to above 300 K by 19 kbar. A low temperature, superconducting dome (T-c similar to 12 K) is centered around 5 kbar, extending down to 2.3 kbar and up to 8.6 kbar. This superconducting phase appears to exist when the low pressure transition is suppressed sufficiently, but before the high pressure transition has reduced the resistivity too dramatically.

Alternate JournalPhys. Rev. Lett.