• Featured in Physics

Pressure Induced Superconductivity in CaFe2As2

Milton S. Torikachvili, Sergey L. Bud’ko, Ni Ni, and Paul C. Canfield
Phys. Rev. Lett. 101, 057006 – Published 31 July 2008
Physics logo See Synopsis: The pressure is on to ban doping

Abstract

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 (Tc12K) 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.

  • Figure
  • Figure
  • Figure
  • Received 3 July 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.057006

©2008 American Physical Society

Synopsis

Key Image

The pressure is on to ban doping

Published 11 August 2008

The ability to tune the onset of superconductivity in a single crystal with other means than chemical doping makes the interpretation of results much cleaner. Now, scientists demonstrate pressure-induced superconductivity in undoped crystals of the pnictide CaFe2As2.

See more in Physics

Authors & Affiliations

Milton S. Torikachvili

  • Department of Physics, San Diego State University, San Diego, California 92182-1233, USA

Sergey L. Bud’ko, Ni Ni, and Paul C. Canfield

  • Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 101, Iss. 5 — 1 August 2008

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×