Microscopic coexistence of antiferromagnetic order and superconductivity in Ba$_{0.77}$K$_{0.23}$Fe$_{2}$As$_{2}$

C. T. Lin; D. L. Sun; Guo-qing Zheng; J. Yang; R. Zhou; Z. Li

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Microscopic coexistence of antiferromagnetic order and superconductivity in Ba_(0.77)K_(0.23)Fe₂As₂

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arxiv 1204.2434 v2 pith:7NUXFM3T submitted 2012-04-11 cond-mat.supr-con

Microscopic coexistence of antiferromagnetic order and superconductivity in Ba_(0.77)K_(0.23)Fe₂As₂

Z. Li , R. Zhou , D. L. Sun , J. Yang , C. T. Lin , Guo-qing Zheng This is my paper

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We report ^{75}As nuclear magnetic resonance studies on an underdoped single-crystal Ba0.77K0.23Fe2As2 with Tc = 16.5 K. Below T_N = 46 K, the NMR peaks for H//c split and those for H //a shift to higher frequencies, which indicates that an internal magnetic field along the c axis develops below T_N. The spin-lattice relaxation rate 1/T_1 measured at the shifted peak with H//a, which experiences the internal field, shows a distinct decrease below Tc({\mu}_0H = 12 T) = 16 K, following a T^3 relation at low temperatures. Our results show unambiguously that antiferromagnetic order and superconductivity coexist microscopically. The unusual superconducting state with the coexisting magnetism is highlighted.

Microscopic coexistence of antiferromagnetic order and superconductivity in Ba_(0.77)K_(0.23)Fe₂As₂

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