x F x x F x with x=0.0 and x=0.2, are crystallized in a single phase tetragonal structure with space group P4/nmm. The resistivity measurement shows superconductivity for the x=0.20 sample with T c (onset) ?1.7?K. The upper critical field, [H c2(0)] is estimated ?770?kOe by Ginzburg–Landau (GL) theory. Broadening of superconducting transition in magnetotransport is studied through thermally activated flux flow in an applied field up to 130?kOe. The flux flow activation energy (U/k B ) is estimated ?215?K for 1?kOe field. Magnetic measurements exhibited bulk superconductivity with lower critical field (H c1) of ?.2?kOe at 2?K. In the normal state, the paramagnetic nature of compound confirms no trace of magnetic impurity, which orders ferromagnetically. AC susceptibility measurements have been carried out for SmFeAsO0.80F0.20 sample at various amplitude and frequencies of applied AC drive field. The intergranular critical current density (J c ) is estimated. Specific heat [C p (T)] measurement showed an anomaly at around 140?K due to the SDW ordering of Fe, followed by another peak at 5?K corresponding to the antiferromagnetic (AFM) ordering of Sm+3 ions in the SmFeAsO compound. Interestingly, the change in entropy (marked by the C p transition height) at 5?K for Sm+3 AFM ordering is heavily reduced in the case of the superconducting SmFeAsO0.80F0.20 sample." />
Magneto-transport and Magnetic Susceptibility of SmFeAsO1?em class="a-plus-plus">x F x (x=0.0 and 0.20)
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  • 作者：R. S. Meena (1) (2)
    Anand Pal (1)
    Shiva Kumar (1)
    K. V. R. Rao (2)
    V. P. S. Awana (1)
  • 关键词：Oxy ; arsenide superconductor family ; Superconductivity ; X ; Ray diffraction ; Rietveld analysis ; Magnetization and thermally activated flux flow
  • 刊名：Journal of Superconductivity Incorporating Novel Magnetism
  • 出版年：2013
  • 出版时间：July 2013
  • 年：2013
  • 卷：26
  • 期：7
  • 页码：2383-2389
  • 全文大小：969KB
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  • 作者单位：R. S. Meena (1) (2)
    Anand Pal (1)
    Shiva Kumar (1)
    K. V. R. Rao (2)
    V. P. S. Awana (1)

    1. Quantum Phenomena and Application Division, National Physical Laboratory (CSIR), Dr. K.S. Krishnan Road, New Delhi, 110012, India
    2. Department of Physics, University of Rajasthan, Jaipur, 302055, India
  • ISSN：1557-1947
文摘
We report superconductivity in the SmFeAsO1?em class="a-plus-plus">x F x for the x=0.2 system being synthesized using the single step solid state reaction route. Rietveld analysis of room temperature X-ray diffraction (XRD) data shows the studied samples, SmFeAsO1?em class="a-plus-plus">x F x with x=0.0 and x=0.2, are crystallized in a single phase tetragonal structure with space group P4/nmm. The resistivity measurement shows superconductivity for the x=0.20 sample with T c (onset) ?1.7?K. The upper critical field, [H c2(0)] is estimated ?770?kOe by Ginzburg–Landau (GL) theory. Broadening of superconducting transition in magnetotransport is studied through thermally activated flux flow in an applied field up to 130?kOe. The flux flow activation energy (U/k B ) is estimated ?215?K for 1?kOe field. Magnetic measurements exhibited bulk superconductivity with lower critical field (H c1) of ?.2?kOe at 2?K. In the normal state, the paramagnetic nature of compound confirms no trace of magnetic impurity, which orders ferromagnetically. AC susceptibility measurements have been carried out for SmFeAsO0.80F0.20 sample at various amplitude and frequencies of applied AC drive field. The intergranular critical current density (J c ) is estimated. Specific heat [C p (T)] measurement showed an anomaly at around 140?K due to the SDW ordering of Fe, followed by another peak at 5?K corresponding to the antiferromagnetic (AFM) ordering of Sm+3 ions in the SmFeAsO compound. Interestingly, the change in entropy (marked by the C p transition height) at 5?K for Sm+3 AFM ordering is heavily reduced in the case of the superconducting SmFeAsO0.80F0.20 sample.

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