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

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arxiv 0906.4740 v3 pith:5DALG73K submitted 2009-06-25 cond-mat.supr-con cond-mat.str-el

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

K. Kitagawa , N. Katayama , H. Gotou , T. Yagi , K. Ohgushi , T. Matsumoto , Y. Uwatoko , M. Takigawa This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords hybridantiferromagneticformationnuclearpressurespontaneoussrfe2as2state
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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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