Suchitra E Sebastian et al 2008 J. Phys.: Condens. Matter 20 422203 doi:10.1088/0953-8984/20/42/422203
Suchitra E Sebastian1,4, J Gillett1, N Harrison2, P H C Lau1, D J Singh3, C H Mielke2 and G G Lonzarich1
Show affiliationsWe report measurements of quantum oscillations in SrFe2As2—which is an antiferromagnetic parent of the iron arsenide family of superconductors—known to become superconducting under doping and the application of pressure. The magnetic field and temperature dependences of the oscillations between 20 and 55 T in the liquid helium temperature range suggest that the electronic excitations are those of a Fermi liquid. We show that the observed Fermi surface comprising small pockets is consistent with the formation of a spin-density wave. Our measurements thus demonstrate that high Tc superconductivity can occur on doping or pressurizing a conventional metallic spin-density wave state.
71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
74.70.Dd Ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides, etc.)
74.62.Dh Effects of crystal defects, doping and substitution
Issue 42 (22 October 2008)
Received 20 July 2008
Published 18 September 2008
Suchitra E Sebastian et al 2008 J. Phys.: Condens. Matter 20 422203
Theodore Van Duzer et al 2002 Supercond. Sci. Technol. 15 1669
Jeong Young Park and P A Thiel 2008 J. Phys.: Condens. Matter 20 314012
Mark F Smith et al 2004 Phys. Med. Biol. 49 2437
Eugene Butikov 2006 Eur. J. Phys. 27 1071
Yuping He and Yiping Zhao 2009 Nanotechnology 20 204008
G. Aulanier et al 2002 ApJ 567 L97
Narayan Poudyal et al 2004 J. Phys. D: Appl. Phys. 37 L45
X S Peng et al 2002 J. Phys. D: Appl. Phys. 35 L101
José M Soler et al 2002 J. Phys.: Condens. Matter 14 2745