Physics – Condensed Matter – Superconductivity
Scientific paper
2009-06-20
Phys. Rev. B 80, 104506 (2009)
Physics
Condensed Matter
Superconductivity
Version as appeared in PRB
Scientific paper
10.1103/PhysRevB.80.104506
We performed elastic neutron scattering and magnetization measurements on Fe(1.07)Te(0.75)Se(0.25) and FeTe(0.7)Se(0.3). Short-range incommensurate magnetic order is observed in both samples. In the former sample with higher Fe content, a broad magnetic peak appears around (0.46,0,0.5) at low temperature, while in FeTe(0.7)Se(0.3) the broad magnetic peak is found to be closer to the antiferromagnetic (AFM) wave-vector (0.5,0,0.5). The incommensurate peaks are only observed on one side of the AFM wave-vector for both samples, which can be modeled in terms of an imbalance of ferromagnetic/antiferromagnetic correlations between nearest-neighbor spins. We also find that with higher Se (and lower Fe) concentration, the magnetic order becomes weaker while the superconducting temperature and volume increase.
Gu Genda
Li Qiang
Lin Zhi Wei
Ratcliff William
Tranquada John M.
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