Coexistence of competing antiferromagnetic and superconducting phases in the underdoped Ba(Fe0.953Co0.047)2As2 compound using x-ray and neutron scattering techniques.
Neutron and x-ray diffraction studies show that the simultaneous first-order transition to an orthorhombic and antiferromagnetic (AFM) ordered state in BaFe2As2 splits into two transitions with Co doping. For Ba(Fe0.953Co0.047)2As2, a tetragonal-orthorhombic transition occurs at TS=60 K, followed by a second-order transition to AFM order at TN=47 K. Superconductivity occurs in the orthorhombic state below TC=17 K and coexists with AFM. Below TC, the static Fe moment is reduced along with a redistribution of low energy magnetic excitations indicating competition between coexisting superconductivity and AFM order.
Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011 USA.
D K
DK
Pratt
W
W
Tian
A
A
Kreyssig
J L
JL
Zarestky
S
S
Nandi
N
N
Ni
S L
SL
Bud'ko
P C
PC
Canfield
A I
AI
Goldman
R J
RJ
McQueeney