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Percolative Antiferromagnetism Controlled by Magnetic Field in NaFe1-xCoxAs
Long Ma1, J. Dai1, X. R. Lu1, Yu Song2, D. Hu3, S. L. Li3, Pengcheng Dai2,3, Chenglin Zhang2,
B. Normand1 and Weiqiang Yu1
1
Department of Physics, Renmin University of China, Beijing 100872, China
2
Department of Physics and Astronomy, Rice University, USA
3
Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Using 23Na NMR as a sensitive local probe in the underdoped NaFe1-xCoxAs, we
revealed a percolative antiferromagnetism at the verge of the quantum phase
transition. The volume fraction and Neel temperature of the long-range ordered
antiferromagnetism decreases with the application of external magnetic field along the
c-axis of the crystal, which indicates a percolative behavior. Below TC,
superconductivity also percolates in paramagnetic islands with enlarging volume upon
cooling, by reducing the volume fraction of the antiferromagnetic, non
superconducting regions. The application of magnetic field further suppress the
magnetic volume fraction and enhances the superconducting volume fraction. Such
controllable percolative behavior of antiferromagnetism and superconductivity reveals
competitive and distinctive electronic nature for antiferromagnetic and
superconducting orders.
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