Critical field of Al-doped MgB2 samples:: Correlation with the suppression of the σ-band gap -: art. no. 144505

被引：70
|
作者：
Putti, M
Ferdeghini, C
Monni, M
Pallecchi, I
Tarantini, C
Manfrinetti, P
Palenzona, A
Daghero, D
Gonnelli, RS
Stepanov, VA
机构：
[1] Univ Genoa, Dipartimento Fis, INFM, LAMIA, I-16146 Genoa, Italy
[2] Univ Genoa, Dipartimento Chim & Chim Ind, INFM, LAMIA, I-16146 Genoa, Italy
[3] Politecn Torino, Dipartimento Fis, INFM, LAMIA, I-10129 Turin, Italy
[4] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 14期
关键词：
D O I：
10.1103/PhysRevB.71.144505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, a study of the effect of Al substitution on the upper critical field, B-c2, in AlxMg1-xB2 samples is presented. We find a straightforward correlation between B-c2 and the sigma-band gap, Delta(sigma), evaluated by point-contact measurements. Up to x=0.2, B-c2 can be well described within a clean limit model and its decrease with x is directly related to the suppression of Delta(sigma).
引用
收藏
页数：6
相关论文
共 50 条
  • [21] Complicated nature of the gap in MgB2:: Magnetic-field-dependent optical studies -: art. no. 224519
    Lee, HJ
    Jung, JH
    Kim, KW
    Kim, MW
    Noh, TW
    Wang, YJ
    Kang, WN
    Choi, EM
    Kim, HJ
    Lee, SI
    [J]. PHYSICAL REVIEW B, 2002, 65 (22) : 2245191 - 2245194
  • [22] Thermodynamics of two-band superconductors:: The case of MgB2 -: art. no. 024504
    Dolgov, OV
    Kremer, RK
    Kortus, J
    Golubov, AA
    Shulga, SV
    [J]. PHYSICAL REVIEW B, 2005, 72 (02)
  • [23] Theory of fluctuations in a two-band superconductor:: MgB2 -: art. no. 064523
    Koshelev, AE
    Varlamov, AA
    Vinokur, VM
    [J]. PHYSICAL REVIEW B, 2005, 72 (06)
  • [24] High upper critical field and irreversibility field in MgB2 coated-conductor fibers -: art. no. 252509
    Ferrando, V
    Orgiani, P
    Pogrebnyakov, AV
    Chen, J
    Li, Q
    Redwing, JM
    Xi, XX
    Giencke, JE
    Eom, CB
    Feng, QR
    Betts, JB
    Mielke, CH
    [J]. APPLIED PHYSICS LETTERS, 2005, 87 (25) : 1 - 3
  • [25] Increases in the irreversibility field and the upper critical field of bulk MgB2 by ZrB2 addition -: art. no. 042505
    Bhatia, M
    Sumption, MD
    Collings, EW
    Dregia, S
    [J]. APPLIED PHYSICS LETTERS, 2005, 87 (04)
  • [26] Correlation between the residual resistance ratio and magnetoresistance in MgB2 -: art. no. 024502
    Chen, XH
    Wang, YS
    Xue, YY
    Meng, RL
    Wang, YQ
    Chu, CW
    [J]. PHYSICAL REVIEW B, 2002, 65 (02) : 245021 - 245025
  • [27] Field and angular dependence of the Sommerfeld coefficient in Al-doped MgB2 single crystals
    Pribulova, Z.
    Klein, T.
    Marcus, J.
    Marcenat, C.
    Park, M. S.
    Lee, H. -S.
    Lee, H. -G.
    Lee, S. -I.
    [J]. PHYSICAL REVIEW B, 2007, 76 (18)
  • [28] Observation of multiband effects in the microwave complex conductivity of pure and Al-doped MgB2 samples
    Di Gennaro, E
    Lamura, G
    Palenzona, A
    Putti, M
    Andreone, A
    [J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2004, 408 : 125 - 126
  • [29] Influence of the upper critical-field anisotropy on the transport properties of polycrystalline MgB2 -: art. no. 033906
    Eisterer, M
    Krutzler, C
    Weber, HW
    [J]. JOURNAL OF APPLIED PHYSICS, 2005, 98 (03)
  • [30] Suppression of superconducting critical current density by small flux jumps in MgB2 thin films -: art. no. 064512
    Zhao, ZW
    Li, SL
    Ni, YM
    Yang, HP
    Liu, ZY
    Wen, HH
    Kang, WN
    Kim, HJ
    Choi, EM
    Lee, SI
    [J]. PHYSICAL REVIEW B, 2002, 65 (06) : 645121 - 645125
12345