Effect of Mg/B ratio on the superconductivity of MgB2 bulk with SiC addition

被引:9
作者
Zhang, Y. [1 ]
Dou, S. X. [1 ]
Lu, C. [2 ]
Zhou, H. [1 ]
Li, W. X. [1 ]
机构
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
[2] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia
基金
澳大利亚研究理事会;
关键词
CRITICAL-CURRENT DENSITY; TRANSITION-TEMPERATURE; AB-INITIO; STOICHIOMETRY; ENHANCEMENT;
D O I
10.1103/PhysRevB.81.094501
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To improve the self-field critical current density (J(c)) and critical temperature (T-c) in SiC-doped MgB2, optimization of the nominal Mg/B mixing ratio has been performed. The effects of the nominal Mg/B mixing ratio (x:2) on the superconductivity, Raman spectra, current transport properties, and flux pinning mechanisms in MgB2 with 10 wt.% SiC doping were investigated systematically, with x varied from 1 to 1.2. It has been found that the sample with the Mg/B ratio of 1.15:2 exhibited the best Jc performance for all fields (0-8.5 T), and its Tc was also enhanced. The optimized Mg/B ratio diminished the interband scattering caused by Mg or B vacancies, and in turn, increased Tc. The connectivity and disorder were increased in the Mg1.15B2 sample. Both of these were responsible for the improved Jc under all the fields examined.
引用
收藏
页数:7
相关论文
共 40 条
  • [1] TRANSITION-TEMPERATURE OF STRONG-COUPLED SUPERCONDUCTORS REANALYZED
    ALLEN, PB
    DYNES, RC
    [J]. PHYSICAL REVIEW B, 1975, 12 (03): : 905 - 922
  • [3] Phonon dispersion and electron-phonon coupling in MgB2 and AlB2
    Bohnen, KP
    Heid, R
    Renker, B
    [J]. PHYSICAL REVIEW LETTERS, 2001, 86 (25) : 5771 - 5774
  • [4] Multiband model for tunneling in MgB2 junctions -: art. no. 180517
    Brinkman, A
    Golubov, AA
    Rogalla, H
    Dolgov, OV
    Kortus, J
    Kong, Y
    Jepsen, O
    Andersen, OK
    [J]. PHYSICAL REVIEW B, 2002, 65 (18) : 1805171 - 1805174
  • [5] Search for high Tc in layered structures:: The case of LiB
    Calandra, Matteo
    Kolmogorov, Aleksey N.
    Curtarolo, Stefano
    [J]. PHYSICAL REVIEW B, 2007, 75 (14)
  • [6] Superconductivity in dense MgB2 wires
    Canfield, PC
    Finnemore, DK
    Bud'ko, SL
    Ostenson, JE
    Lapertot, G
    Cunningham, CE
    Petrovic, C
    [J]. PHYSICAL REVIEW LETTERS, 2001, 86 (11) : 2423 - 2426
  • [7] Structural and superconducting property variations with nominal Mg non-stoichiometry in MgxB2 and its enhancement of upper critical field
    Chen, Soo K.
    Serquis, Adriana
    Serrano, German
    Yates, Karen A.
    Blamire, Mark G.
    Guthrie, Douglas
    Cooper, John
    Wang, Haiyan
    Margadonna, Serena
    MacManus-Driscoll, Judith L.
    [J]. ADVANCED FUNCTIONAL MATERIALS, 2008, 18 (01) : 113 - 120
  • [8] FLUX PINNING MECHANISMS IN TYPE-II SUPERCONDUCTORS
    DEWHUGHES, D
    [J]. PHILOSOPHICAL MAGAZINE, 1974, 30 (02) : 293 - 305
  • [9] Raman spectra of neutron-irradiated and Al-doped MgB2
    Di Castro, D.
    Cappelluti, E.
    Lavagnini, M.
    Sacchetti, A.
    Palenzona, A.
    Putti, M.
    Postorino, P.
    [J]. PHYSICAL REVIEW B, 2006, 74 (10)
  • [10] Mechanism of enhancement in electromagnetic properties of MgB2 by nano SiC doping
    Dou, S. X.
    Shcherbakova, O.
    Yoeh, W. K.
    Kim, J. H.
    Soltanian, S.
    Wang, X. L.
    Senatore, C.
    Flukiger, R.
    Dhalle, M.
    Husnjak, O.
    Babic, E.
    [J]. PHYSICAL REVIEW LETTERS, 2007, 98 (09)