Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.117006
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Funding
- European Community [516858]
- DFG
- FCI
- BMBF
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Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba1-xKxFe2As2 by means of x-ray powder diffraction, neutron scattering, muon-spin rotation (mu SR), and magnetic force microscopy (MFM). Static antiferromagnetic order sets in below T-m approximate to 70 K as inferred from the neutron scattering and zero-field-mu SR data. Transverse-field mu SR below T-c shows a coexistence of magnetically ordered and nonmagnetic states, which is also confirmed by MFM imaging. We explain such coexistence by electronic phase separation into antiferromagnetic and superconducting- or normal-state regions on a lateral scale of several tens of nanometers. Our findings indicate that such mesoscopic phase separation can be considered an intrinsic property of some iron pnictide superconductors.
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