A neutron scattering study of the interplay between structure and magnetism in Ba(Fe1−xCox)2As2

Journal Article · Wed Jun 02 04:00:00 EDT 2010 · Submitted to Physical Review B

OSTI ID:981374

Lester, C

Single crystal neutron diffraction is used to investigate the magnetic and structural phase diagram of the electron doped superconductor Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. Heat capacity and resistivity measurements have demonstrated that Co doping this system splits the combined antiferromagnetic and structural transition present in BaFe{sub 2}As{sub 2} into two distinct transitions. For x=0.025, we find that the upper transition is between the high-temperature tetragonal and low-temperature orthorhombic structures with (T{sub TO} = 99 {+-} 0.5 K) and the antiferromagnetic transition occurs at T{sub AF} = 93 {+-} 0.5 K. We find that doping rapidly suppresses the antiferromagnetism, with antiferromagnetic order disappearing at x {approx} 0.055. However, there is a region of co-existence of antiferromagnetism and superconductivity. The effect of the antiferromagnetic transition can be seen in the temperature dependence of the structural Bragg peaks from both neutron scattering and x-ray diffraction. We infer from this that there is strong coupling between the antiferromagnetism and the crystal lattice.

• Research Organization: SLAC National Accelerator Laboratory (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 981374
• Report Number(s): SLAC-PUB-14046
• Journal Information: Submitted to Physical Review B, Journal Name: Submitted to Physical Review B
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTIFERROMAGNETISM
BRAGG CURVE
CRYSTAL LATTICES
ELECTRONS
MAGNETISM
MATSCI
MONOCRYSTALS
NEUTRON DIFFRACTION
NEUTRONS
PHASE DIAGRAMS
SCATTERING
SPECIFIC HEAT
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION