University of Wollongong
Browse

File(s) not publicly available

Unconventional superconductivity of NdFeAsO0.82F0.18 indicated by the low temperature dependence of the lower critical field Hc1

journal contribution
posted on 2024-11-16, 09:57 authored by Xiaolin WangXiaolin Wang, Shi DouShi Dou, ZhiAn Ren, Wei Yi, ZhengCai Li, ZhongXian Zhao, Sung-Ik Lee
We measured the initial M–H curves for a sample of the newly discovered superconductor NdFeAsO0.82Fe0.18, which had a critical temperature, Tc, of 51 K and was fabricated at the high pressure of 6 GPa. The lower critical field, Hc1, was extracted from the deviation point of the Meissner linearity in the M–H curves, which show linear temperature dependence in the low temperature region down to 5 K. The Hc1(T) indicates no s-wave superconductivity, but rather an unconventional superconductivity with a nodal gap structure. Furthermore, the linearity of Hc1 at low temperature does not hold at high temperature, but shows other characteristics, indicating that this superconductor might have multi-gap features. Based on the low temperature nodal gap structure, we estimate that the maximum gap magnitude Δ0 = (1.6 ± 0.2) kBTc.

Funding

Current limiting mechanisms in magnesium diboride superconductors

Australian Research Council

Find out more...

History

Citation

Wang, P, Dou, SX, Ren, Z, Yi, W, Li, Z, Zhao, Z & Lee, S (2009), Unconventional superconductivity of NdFeAsO0.82F0.18 indicated by the low temperature dependence of the lower critical field Hc1, Journal of Physics: Condensed Matter, 21(20), pp. 1-3.

Journal title

Journal of Physics Condensed Matter

Volume

21

Issue

20

Language

English

RIS ID

31517

Usage metrics

    Categories

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC