Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe1-xCox)(2)As-2
| Title | Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe1-xCox)(2)As-2 |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Ran S, Bud'ko SL, Straszheim WE, Soh J, Kim MG, Kreyssig A, Goldman AI, Canfield PC |
| Journal Title | Physical Review B |
| Volume | 85 |
| Pages | 224528 |
| Date Published | 06 |
| Type of Article | Article |
| ISBN Number | 1098-0121 |
| Accession Number | WOS:000305557700003 |
| Keywords | bafe2as2, growth, iron-pnictides, single-crystals |
| Abstract | We have grown single-crystal samples of Co substituted CaFe2As2 using an FeAs flux and systematically studied the effects of annealing/quenching temperature on the physical properties of these samples. Whereas the as-grown samples (quenched from 960 degrees C) all enter the collapsed tetragonal phase upon cooling, annealing/quenching temperatures between 350 and 800 degrees C can be used to tune the system to low-temperature antiferromagnetic/orthorhomic or superconducting states as well. The progression of the transition temperature versus annealing/quenching temperature (T-T-anneal) phase diagrams with increasing Co concentration shows that, by substituting Co, the antiferromagnetic/orthorhombic and the collapsed tetragonal phase lines are separated and bulk superconductivity is revealed. We established a 3D phase diagram with Co concentration and annealing/quenching temperature as two independent control parameters. At ambient pressure, for modest x and T-anneal values, the Ca(Fe1-xCox)(2)As-2 system offers ready access to the salient low-temperature states associated with Fe-based superconductors: antiferromagnetic/orthorhombic, superconducting, and nonmagnetic/collapsed tetragonal. |
| URL | <Go to ISI>://WOS:000305557700003 |
| DOI | 10.1103/PhysRevB.85.224528 |
| Alternate Journal | Phys. Rev. B |
