Spontaneous formation of a superconducting and antiferromagnetic hybrid state in SrFe2As2 under high pressure

Details Spontaneous formation of a superconducting and antiferromagnetic hybrid state in SrFe2As2 under high pressure Spontaneous formation of a superconducting and antiferromagnetic hybrid state in SrFe2As2 under high pressure

2009-06-25

arxiv.org/abs/0906.4740v3

Phys. Rev. Lett. 103, 257002 (2009).

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.103.257002

We report a novel superconducting (SC) and antiferromagnetic (AF) hybrid state in SrFe2As2 revealed by 75As nuclear magnetic resonance (NMR) experiments on a single crystal under highly hydrostatic pressure up to 7 GPa. The NMR spectra at 5.4 GPa indicate simultaneous development of the SC and AF orders below 30 K. The nuclear spin-lattice relaxation rate in the SC domains shows a substantial residual density of states, suggesting proximity effects due to spontaneous formation of a nano-scale SC/AF hybrid structure. This entangled behavior is a remarkable example of a self-organized heterogeneous structure in a clean system.

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