Flux dynamics and vortex phase diagram in Ba(Fe1-xCox)2As2 single crystals revealed by magnetization and its relaxation

被引：143
|
作者：
Shen, Bing [1 ]
Cheng, Peng [1 ]
Wang, Zhaosheng [1 ]
Fang, Lei [1 ]
Ren, Cong [1 ]
Shan, Lei [1 ]
Wen, Hai-Hu [1 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 01期
关键词：
HIGH-TEMPERATURE SUPERCONDUCTORS; ACTIVATION-ENERGIES; YBA2CU4O8; FILMS; CREEP; YBA2CU3O7-DELTA; VORTICES; BI2SR2CACU2O8; FLUCTUATION; HYSTERESIS; BARRIERS;
D O I：
10.1103/PhysRevB.81.014503
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Magnetization and its relaxation have been measured in Ba(Fe1-xCox)(2)As-2 single crystals at various doping levels ranging from very underdoped to very overdoped regimes. A sizable magnetization-relaxation rate has been observed in all samples, indicating a moderate vortex motion and relatively small characteristic pinning energy. Detailed analysis leads to the following conclusions. (1) A prominent second-peak (SP) effect was observed in the samples around the optimal doping level (x approximate to 0.08), but it becomes invisible or very weak in the very underdoped and overdoped samples. (2) The magnetization-relaxation rate is inversely related to the transient superconducting current density revealing the nonmonotonic field and temperature dependence through the SP region. (3) A very sharp magnetization peak was observed near zero field which corresponds to a much reduced relaxation rate. (4) A weak temperature dependence or a plateau of relaxation rate was found in the intermediate-temperature region. Together with the treatment of the generalized inversion scheme, we suggest that the vortex dynamics is describable by the collective pinning model. Finally, vortex phase diagrams were drawn for all the samples showing a systematic evolution of vortex dynamics.
引用
收藏
页数：12
相关论文
共 50 条
  • [31] Anomalous surface lattice dynamics in the low-temperature phase of Ba(Fe1-xCox)2As2
    Teng, Jing
    Chen, Chen
    Xiong, Yimin
    Zhang, Jiandi
    Jin, Rongying
    Plummer, E. W.
    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2013, 110 (03) : 898 - 903
  • [32] London penetration depth in single crystals of Ba(Fe1-xCox)2As2 spanning underdoped to overdoped compositions
    Gordon, R. T.
    Martin, C.
    Kim, H.
    Ni, N.
    Tanatar, M. A.
    Schmalian, J.
    Mazin, I. I.
    Bud'ko, S. L.
    Canfield, P. C.
    Prozorov, R.
    PHYSICAL REVIEW B, 2009, 79 (10):
  • [33] Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1-xCox)2As2
    Huang, X. Y.
    Haney, D. J.
    Singh, Y. P.
    Hu, T.
    Xiao, H.
    Wen, Hai-Hu
    Dzero, M.
    Almasan, C. C.
    PHYSICAL REVIEW B, 2017, 95 (18)
  • [34] Irreversibility lines and anomalous Meissner effect in Ba(Fe1-xCox)2As2 superconducting crystals
    de Lima, O. F.
    de Almeida, R. L.
    Garitezi, T. M.
    Adriano, C.
    Rosa, P. F. S.
    Pagliuso, P. G.
    SUPERCONDUCTIVITY CENTENNIAL CONFERENCE 2011, 2012, 36 : 1661 - 1666
  • [35] Lack of superconductivity in the phase diagram of single-crystalline Eu(Fe1-xCox)2As2 grown by transition metal arsenide flux
    Wang, Gang
    Meier, William R.
    Straszheim, Warren E.
    Slagle, Joshua
    Bud'ko, Sergey L.
    Canfield, Paul C.
    PHYSICAL REVIEW MATERIALS, 2018, 2 (10):
  • [36] Theoretical investigation of optical conductivity in Ba(Fe1-xCox)2As2
    Sanna, A.
    Bernardini, F.
    Profeta, G.
    Sharma, S.
    Dewhurst, J. K.
    Lucarelli, A.
    Degiorgi, L.
    Gross, E. K. U.
    Massidda, S.
    PHYSICAL REVIEW B, 2011, 83 (05):
  • [37] Signatures of quantum criticality in the thermopower of Ba(Fe1-xCox)2As2
    Arsenijevic, S.
    Hodovanets, H.
    Gaal, R.
    Forro, L.
    Bud'ko, S. L.
    Canfield, P. C.
    PHYSICAL REVIEW B, 2013, 87 (22)
  • [38] Observation of Incipient Charge Nematicity in Ba(Fe1-XCoX)2As2
    Gallais, Y.
    Fernandes, R. M.
    Paul, I.
    Chauviere, L.
    Yang, Y. -X.
    Measson, M. -A.
    Cazayous, M.
    Sacuto, A.
    Colson, D.
    Forget, A.
    PHYSICAL REVIEW LETTERS, 2013, 111 (26)
  • [39] Evolution of the optical spectrum with doping in Ba(Fe1-xCox)2As2
    Nakajima, M.
    Ishida, S.
    Kihou, K.
    Tomioka, Y.
    Ito, T.
    Yoshida, Y.
    Lee, C. H.
    Kito, H.
    Iyo, A.
    Eisaki, H.
    Kojima, K. M.
    Uchida, S.
    PHYSICAL REVIEW B, 2010, 81 (10):
  • [40] Correlated vortex pinning in slightly orthorhombic twinned Ba(Fe1-xCox)2As2 single crystals: Possible shift of the vortex-glass/liquid transition
    Marziali Bermudez, M.
    Pasquini, G.
    Bud'ko, S. L.
    Canfield, P. C.
    PHYSICAL REVIEW B, 2013, 87 (05)
12345