Research ArticlePHYSICS

Unprecedented high irreversibility line in the nontoxic cuprate superconductor (Cu,C)Ba2Ca3Cu4O11+δ

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Science Advances  28 Sep 2018:
Vol. 4, no. 9, eaau0192
DOI: 10.1126/sciadv.aau0192
  • Fig. 1 Temperature dependence of resistivity and magnetization of sample 1.

    (A) Temperature dependence of resistivity under different magnetic fields from 0 to 15 T. The inset shows the temperature dependence of magnetic susceptibility measured in ZFC and FC modes under a magnetic field of 10 Oe. (B) The same data in (A) in the semilogarithmic scale. The blue horizontal dashed line represents the criterion of resistivity 1%ρn (Tc), which is used to determine the irreversibility line.

  • Fig. 2 Magnetization and critical current density of powdered sample (sample 1).

    (A) MHLs of high pressure synthesized (Cu,C)-1234 from 4.2 to 110 K under magnetic fields up to 7 T. (B) Field dependence of critical current density Jc at various temperatures. Jc is determined by the formula Jc (A/cm2) = 30ΔM/d, where d (in units of centimeter) is the averaged grain size of the powder sample. Some strongly scattered data are the bad points during the SQUID measurements on powdered samples. Because of the presence of an unphysical hysteresis background in our SQUID-VSM measurements corresponding to a small current density, we have deducted the background log (Jc) = 0.295H + 1.84 from the data, with Jc in units of amperes per square centimeter and H in tesla.

  • Fig. 3 Irreversibility lines of different cuprate systems.

    Irreversibility lines for (Cu,C)-1234 (this work, sample 1 and sample 2), YBCO 1 and YBCO 2 (single crystals, H||c axis) (9, 10), Bi-2223 (thin film, blue down triangles) (6), Bi-2223 (single crystal, cyan diamond) (7), and (Tl,Pb)-1223 (pink triangles) (5). The highlighted area indicates the region for zero dissipation above the boundary of YBCO. The black dashed line shows the trend of irreversibility line of YBCO with Tc = 91 K.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/4/9/eaau0192/DC1

    Fig. S1. Resistivity and magnetization versus temperature of sample 2.

    Fig. S2. Magnetization and critical current density of sample 2 in bulk form.

    Fig. S3. SEM image of the surface after being treated by hydrochloric acid of sample 1.

    Fig. S4. Powder XRD pattern for sample 1.

    Fig. S5. SEM images and composition analysis on fresh surface of sample 1.

  • Supplementary Materials

    This PDF file includes:

    • Fig. S1. Resistivity and magnetization versus temperature of sample 2.
    • Fig. S2. Magnetization and critical current density of sample 2 in bulk form.
    • Fig. S3. SEM image of the surface after being treated by hydrochloric acid of sample 1.
    • Fig. S4. Powder XRD pattern for sample 1.
    • Fig. S5. SEM images and composition analysis on fresh surface of sample 1.

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