Microscopic co-existence of superconductivity and magnetism in Ba1-xKxFe2As2

Details Microscopic co-existence of superconductivity and magnetism in Ba1-xKxFe2As2 Microscopic co-existence of superconductivity and magnetism in Ba1-xKxFe2As2

2011-08-22

arxiv.org/abs/1108.4307v1

Phys. Rev. Lett. 107, 237001 (2011)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.237001

It is widely believed that, in contrast to its electron doped counterparts, the hole doped compound Ba1-xKxFe2As2 exhibits a mesoscopic phase separation of magnetism and superconductivity in the underdoped region of the phase diagram. Here, we report a combined high-resolution x-ray powder diffraction and volume sensitive muon spin rotation study of underdoped Ba1-xKxFe2As2 (0 \leq x \leq 0.25) showing that this paradigm is wrong. Instead we find a microscopic coexistence of the two forms of order. A competition of magnetism and superconductivity is evident from a significant reduction of the magnetic moment and a concomitant decrease of the magneto-elastically coupled orthorhombic lattice distortion below the superconducting phase transition.

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