^<75>As NMR Study of Hole-Doped Superconductor Ba_<1-x>K_xFe_2As_2 (T_c * 38K)

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Abstract

We report the ^<75>As nuclear magnetic resonance (NMR) measurement of the hole-doped superconductor Ba_<1-x>K_xFe_2As_2 with different lattice parameters and different superconducting volume fractions (T_cc≃38K). ^<75>As-NMR spectra revealed that the magnetically ordered and superconducting phases are microscopically separated. The spin-lattice relaxation rate 1/T_1 in the normal state reflects the existence of a large two-dimensional antiferromagnetic spin fluctuation. The 1/T_1 in the superconducting state down to the lowest measurement temperature T varies close to T^3. In addition, it exhibits no coherence peak just below T_c. This shows a T dependence similar to those of other iron pnictides.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 78(3), "33704-1"-"33704-4", 2009-03-15

    The Physical Society of Japan (JPS)

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  • Pseudogap and Superconductivity in Iron-Based Layered Superconductor Studied by Fluctuation-Exchange Approximation

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Codes

  • NII Article ID (NAID)
    110007138888
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    10182744
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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