Magnetic order in the CaFe1−xCoxAsF (x=0.00,0.06,0.12) superconducting compounds
Y. Xiao, Y. Su, R. Mittal, T. Chatterji, T. Hansen, C. M. N. Kumar, S. Matsuishi, H. Hosono, Th. Brueckel
DOI 10.1103/PhysRevB.79.060504 · Physical Review B
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Abstract
A neutron powder-diffraction experiment has been performed to investigate the structural phase transition and magnetic order in CaFe1−xCoxAsF superconductor compounds (x=0.00,0.06,0.12). The parent compound CaFeAsF undergoes a tetragonal to orthorhombic phase transition at 134(3) K, while the magnetic order in the form of a spin-density wave (SDW) sets in at 114(3) K. The antiferromagnetic structure of the parent compound has been determined with a unique propagation vector k=(1,0,1) and the Fe saturation moment of 0.49(5)μB, aligned along the long a axis. With increasing Co doping, the long-range antiferromagnetic order has been observed to coexist with superconductivity in the orthorhombic phase of the underdoped CaFe0.94Co0.06AsF with a reduced Fe moment [∼0.15(5)μB]. Magnetic order is completely suppressed in optimally doped CaFe0.88Co0.12AsF. We argue that the coexistence of SDW and superconductivity might be related to mesoscopic phase separation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe0.94Co0.06AsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| CaFe0.88Co0.12AsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| Ca0.4Pr0.6FeAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52.8 | Pressure not reported | unknown |
| Ca0.4Nd0.6FeAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57.4 | Pressure not reported | unknown |
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