Enhanced physical properties of single crystal Fe0.99Te0.63Se0.37 prepared by self-flux synthesis method

K. Onar, B. Özçelik, N. K. Güler, H. Okazaki, H. Takeya, Y. Takano, M. E. Yakinci

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    In this study, we have systemically studied the physical, electrical and magnetic properties of Fe0.99Te0.63Se0.37 single crystalline samples prepared by self-flux method. We found that the self-flux method is a suitable synthesis technique for this alloys if setting of experimental parameters made carefully. The M-H curve affirms that samples are typical type-II superconductor. Strong sign of bulk superconductivity, even after high field measurements, were seen. Calculated Jcmag values, at zero field, were found to be 7.7 × 105 Acm-2 and 2.6 × 104 Acm-2 for 5 K and 10 K respectively. The upper critical field Hc2(0) has been determined with the magnetic field parallel to the sample surface and yielding a maximum value of 65 T. At the zero field coherence length, ξ, value was calculated to be 2.24 nm for 10% Tcoffset which is significantly larger (approximately 6 fold) than the unit cell, a, and indicating the absence of weak link behavior in the sample. Calculated μ0Hc2(0)/kBTc rate indicated comparably higher value (3.66 T/K) than the Pauli limit (1.84 T/K) and obtained results were suggested unconventional nature of superconductivity in our samples.

    Original languageEnglish
    Pages (from-to)164-170
    Number of pages7
    JournalJournal of Alloys and Compounds
    Volume683
    DOIs
    Publication statusPublished - 2016 Oct 25

    Keywords

    • Activation
    • Energy
    • FeTeSe single crystalline superconductors
    • Ginzburg-Landau parameter
    • Self-flux method

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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