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A neutron scattering study of the interplay between structure and magnetism in Ba(Fe1−xCox)2As2
| Content Provider | United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV) |
|---|---|
| Author | Lester, C. |
| Organization | SLAC National Accelerator Lab., Menlo Park, CA (United States) |
| Abstract | 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. |
| Sponsorship | USDOE |
| Related Links | https://www.osti.gov/biblio/981374 |
| File Format | |
| Journal | Physical Review B |
| Language | English |
| Publisher Date | 2010-06-02 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ANTIFERROMAGNETISM BRAGG CURVE CRYSTAL LATTICES ELECTRONS MAGNETISM MONOCRYSTALS NEUTRON DIFFRACTION NEUTRONS PHASE DIAGRAMS SCATTERING SPECIFIC HEAT SUPERCONDUCTIVITY SUPERCONDUCTORS TEMPERATURE DEPENDENCE X-RAY DIFFRACTION MATSCI |
| Content Type | Text |
| Resource Type | Article |
