Ultrafast Probing of Antiferromagnetism and Dynamic Critical Behaviors in Iron Pnictide

ORAL

Abstract

Iron pnictide superconductors and their parent compounds exhibit superconductivity, antiferromagnetism, poor conductivity in undoped phase, structural instabilities, and additional peculiarities. Much of the complexity originates from strong interactions among the spin, charge, lattice degrees of freedom, where correlated excitations and self-organization among them occur and cause exotic cooperative behaviors. Time-resolved magneto-optical spectroscopy has been developed as a power tool to dynamically disentangle various degrees of freedoms by exploring their responses to fs photoexcitation. Using femtosecond optical and magneto-optical technique, we were able to measure and decoupling dynamics of AFM, structure and electronic excitations in parent BaFe$_{2}$As$_{2}$ and also underdoped sample (Co=4.7{\%}). The technique demonstrated provides an extremely powerful tool to reveal fs dynamics and critical behaviors of various order parameters in the iron pnictide system.

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Authors

  • Tianqi Li

    Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University

  • Aaron Patz

    Ames Laboratory and Dept of Physics and Astro, Iowa State University, Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University

  • Sheng Ran

    Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University

  • Sergey Bud'ko

    Ames Laboratory US DOE and Dept. of Physics and Astronomy, ISU, Ames, IA 50011, USA and SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 38054 Grenoble, France, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University, Department of Physics and Astronomy, Iowa State University and Ames Laboratory

  • Paul Canfield

    Ames Laboratory, Iowa State University, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University, Department of Physics and Astronomy, Iowa State University and Ames Laboratory, Ames Laboratory and Iowa State University, Ames Laboratory and Department of Physics, Iowa State University

  • Jingang Wang

    Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University, Department of Physics and Astronomy, Iowa State University, and Ames Laboratory US-DOE