Superconductivity in the La1.85Ce0.15Cu1−xAgxO4−δ system
作者： J.W. Chen , Fu-An Yang
DOI: 10.1016/0921-4534(91)90721-A
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摘要: Abstract We report AC electrical resistance R(T) and DC magnetization measurements on N 2 -annealed La 1.85 Ce 0.15 Cu 1− x Ag O 4−δ samples with 0≤ ≤0.6. R ( T ) reveal that the undoped CuO is an insulator. However, as substituted for Cu, a superconducting transition starts to occur at ∼ 24 K ≥ 0.2. The normal state )/ (280 K) varies systematically , ratio (24 K)/ reaches minimum =0.4. Although signals 0.1, volume fractions obtained are quite small χ −1 curve reveals valence of ions in this system close 3+. H c2 data =0.4 sample also obtained.
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J. G. Bednorz, K. A. M�ller, Possible high Tc superconductivity in the Ba-La-Cu-O system European Physical Journal B. ,vol. 64, pp. 189- 193 ,(1986) , 10.1007/BF01303701
S. S. P. Parkin, V. Y. Lee, E. M. Engler, A. I. Nazzal, T. C. Huang, G. Gorman, R. Savoy, R. Beyers, Bulk Superconductivity at 125 K in Tl2Ca2Ba2Cu3Ox Ten Years of Superconductivity: 1980–1990. ,vol. 60, pp. 309- 312 ,(1988) , 10.1007/978-94-011-1622-0_44
J.T. Markert, E.A. Early, T. Bjørnholm, S. Ghamaty, B.W. Lee, J.J. Neumeier, R.D. Price, C.L. Seaman, M.B. Maple, Two new electron cuprate superconductors, Pr1.85Th0.15CuO4−y and Eu1.85Ce0.15CuO4−y, and properties of Nd2−xCexO4−y Physica C: Superconductivity. ,vol. 158, pp. 178- 182 ,(1989) , 10.1016/0921-4534(89)90314-6
R. J. Cava, R. B. van Dover, B. Batlogg, E. A. Rietman, Bulk superconductivity at 36 K inLa1.8Sr0.2CuO4 Physical Review Letters. ,vol. 58, pp. 408- 410 ,(1987) , 10.1103/PHYSREVLETT.58.408
E.A. Early, N.Y. Ayoub, J. Beille, J.T. Markert, M.B. Maple, Sm1.85Th0.15CuO4−y: A new electron-doped copper oxide superconductor Physica C-superconductivity and Its Applications. ,vol. 160, pp. 320- 322 ,(1989) , 10.1016/0921-4534(89)90068-3
Y. Dalichaouch, B. W. Lee, C. L. Seaman, J. T. Markert, M. B. Maple, Upper critical field of aSm1.85Ce0.15CuO4−ysingle crystal: Interaction between superconductivity and antiferromagnetic order in copper oxides Physical Review Letters. ,vol. 64, pp. 599- 602 ,(1990) , 10.1103/PHYSREVLETT.64.599
M. K. Wu, J. R. Ashburn, C. J. Torng, P. H. Hor, R. L. Meng, L. Gao, Z. J. Huang, Y. Q. Wang, C. W. Chu, Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure Physical Review Letters. ,vol. 58, pp. 908- 910 ,(1987) , 10.1103/PHYSREVLETT.58.908
Z. Z. Sheng, A. M. Hermann, Superconductivity in the rare-earth-free Tl–Ba–Cu–O system above liquid-nitrogen temperature Nature. ,vol. 332, pp. 55- 58 ,(1988) , 10.1038/332055A0
B. A. Auld, J. H. Collins, H. R. Zapp, ADIABATIC TIME DOMAIN CONVERSION OF HYBRID, MAGNETOELASTIC WAVES IN YIG Applied Physics Letters. ,vol. 10, pp. 186- 188 ,(1967) , 10.1063/1.1754904
Z. Z. Sheng, A. M. Hermann, Bulk superconductivity at 120 K in the Tl-Ca/Ba-Cu-O system Nature. ,vol. 332, pp. 138- 139 ,(1988) , 10.1038/332138A0