title: NMR Evidence for Inhomogeneous Nematic Fluctuations in BaFe_{2}(As_{1-x}P_{x})_{2}.
abstract: We present evidence for nuclear spin-lattice relaxation driven by glassy nematic fluctuations in isovalent P-doped BaFe_{2}As_{2} single crystals. Both the ^{75}As and ^{31}P sites exhibit a stretched-exponential relaxation similar to the electron-doped systems. By comparing the hyperfine fields and the relaxation rates at these sites we find that the As relaxation cannot be explained solely in terms of magnetic spin fluctuations. We demonstrate that nematic fluctuations couple to the As nuclear quadrupolar moment and can explain the excess relaxation. These results suggest that glassy nematic dynamics are a common phenomenon in the iron-based superconductors.
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Dioguardi
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: T
authors.initials: T
authors.lastname: Kissikov
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: C H
authors.initials: CH
authors.lastname: Lin
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: K R
authors.initials: KR
authors.lastname: Shirer
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: M M
authors.initials: MM
authors.lastname: Lawson
authors.affiliation: IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: H-J
authors.initials: HJ
authors.lastname: Grafe
authors.affiliation: Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.|Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: J-H
authors.initials: JH
authors.lastname: Chu
authors.affiliation: Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.|Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: I R
authors.initials: IR
authors.lastname: Fisher
authors.affiliation: School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Fernandes
authors.affiliation: Department of Physics, University of California, Davis, California 95616, USA.
authors.forename: N J
authors.initials: NJ
authors.lastname: Curro