Properties of La1.8Sr0.2CuO4 superconductors

Panson, A. J.; Wagner, G. R.; Braginski, A. I.; Gavaler, J. R.; Janocko, M. A.; Pohl, H. C.; Talvacchio, J.
April 1987
Applied Physics Letters;4/20/1987, Vol. 50 Issue 16, p1104
Academic Journal
Critical current, critical field, and carrier density measurements have been made on bulk samples of La1.8Sr0.2CuO4 to assess the potential of such oxide superconductors for practical applications. The importance of preparing samples in a high oxygen pressure was documented. The upper critical field at T=0 was estimated to be 530 kOe. From magnetization hysteresis loops, critical current densities were determined between 0 and 60 kOe. At 60 kOe, the values were 2×103 A/cm2 at 4.2 K and 4×102 A/cm2 at 18 K in samples that exhibited characteristics of weak flux pinning. The effective carrier density at 48 K was 1×1021 cm-3, approximately half of the expected upper limit. A set of microscopic superconducting parameters has been derived from transition temperature, resistivity, and upper and lower critical field measurements made on a single specimen.


Related Articles

  • Upper critical fields and high superconducting transition temperatures of La1.85Sr0.15CuO4 and La1.85Ba0.15CuO4. Capone, D. W.; Hinks, D. G.; Jorgensen, J. D.; Zhang, K. // Applied Physics Letters;3/2/1987, Vol. 50 Issue 9, p543 

    The superconducting transition temperature Tc of La1.85Sr0.15CuO4 is measured to be 34.7 K (midpoint) with a transition width (10–90%) of 2.6 K. The critical field slope at Tc is 2.13 T/K. Using the Werthamer, Helfand, and Hohenberg expression in the dirty limit we estimate the upper...

  • Lanthanum gallate substrates for epitaxial high-temperature superconducting thin films. Sandstrom, R. L.; Giess, E. A.; Gallagher, W. J.; Segmüller, A.; Cooper, E. I.; Chisholm, M. F.; Gupta, A.; Shinde, S.; Laibowitz, R. B. // Applied Physics Letters;11/7/1988, Vol. 53 Issue 19, p1874 

    We demonstrate that lanthanum gallate (LaGaO3) has considerable potential as an electronic substrate material for high-temperature superconducting films. It provides a good lattice and thermal expansion match to YBa2Cu3O7-x, can be grown in large crystal sizes, is compatible with...

  • Characterization of physico-chemical properties of the high-temperature superconductor and LaCoO3 surfaces. Ch&acedil;dzy&nacutee;ski, G.W.; Sternik, D.; Staszczuk, P.; Kucharczyk, B. // Journal of Thermal Analysis & Calorimetry;2004, Vol. 78 Issue 2, p441 

    This paper presents possible applications of thermal analysis and sorptornatic methods to study physico-chemical properties of the high-Tc superconductor Y1Ba2Cu3O7-x and perovskite LaCoO3. It is shown that both Y1Ba2Cu3O7-x and perovskite phase are highly sensitive to water vapour. Mechanism of...

  • Angle-dependent laser-induced voltages in room-temperature polycrystalline wafers of YBa2Cu3O7-x. Tate, K. L.; Hilinski, E. F.; Foster, S. C. // Applied Physics Letters;12/3/1990, Vol. 57 Issue 23, p2407 

    Room-temperature laser-induced voltages were observed in unsupported, polycrystalline wafers of YBa2Cu3O7-x in the absence of a transport current. Peak voltages of ∼1 V were detected in response to 40 mJ pulses of 532 nm light. The rise and fall times for the signals were detector limited....

  • Single-crystal preparation and some characterizations of the superconducting Y-Ba-Cu oxide. Haneda, Hajime; Isobe, Mitsumasa; Hishita, Shunichi; Ishizawa, Yoshio; Shirasaki, Shin-ichi; Yamamoto, Taisei; Yanagitani, Takagimi // Applied Physics Letters;11/30/1987, Vol. 51 Issue 22, p1848 

    Single crystals of Ba2YCu3O7-δ were prepared from melts of a BaO-Y2O3-CuO mixture and characterized by the x-ray microprobe analyzer and x-ray diffraction. Electrical resistivity was measured by the standard four-terminal method. Some crystals have the critical temperature above 77 K. After...

  • Structural characterization of a TlCaBaCu oxide in Tc onset=155 K and Tc zero=123 K superconducting specimens. Liang, J. M.; Liu, R. S.; Chang, L.; Wu, P. T.; Chen, L. J. // Applied Physics Letters;10/10/1988, Vol. 53 Issue 15, p1434 

    The crystal structure of a Tl-Ca-Ba-Cu-O compound in Tc onset=155 K and Tc zero=123 K superconducting specimens was characterized by transmission electron microscopy. Convergent beam electron diffraction analysis established that the phase is of P4/mcc space group. The lattice parameters of the...

  • Properties of Bi(Pb)-Sr-Ca-Cu-O superconducting tapes prepared by the doctor-blade process. Yanagisawa, E.; Morimoto, T.; Dietderich, D. R.; Kumakura, H.; Togano, K.; Maeda, H. // Applied Physics Letters;6/19/1989, Vol. 54 Issue 25, p2602 

    Improved superconducting and mechanical properties were obtained for Bi(Pb)-Sr-Ca-Cu-O tapes, prepared by the combined process of doctor-blade casting, cold rolling, and sintering. The tape has an oriented microstructure with the high Tc plate-like grains having their c axes perpendicular to the...

  • Effect of Li doping on the critical temperature and glass formation in the Bi�Sr�Ca�Cu�O system. Volkov, M. P.; Melekh, B. T.; Bakharev, V. I.; Kartenko, N. F.; Matykin, N. V.; Filin, Yu. N. // Physics of the Solid State;Jan99, Vol. 41 Issue 1, p15 

    A study has been made of the glass-forming ability, structure, and superconducting properties of Bi[sub 2.2]Sr[sub 1.8]Ca[sub 1.05]Cu[sub 2.15]Li[sub x]O[sub y] and Bi[sub 2.2]Sr[sub 1.8]Ca[sub 1.05]Cu[sub 2.15 - x]Li[sub x]O[sub y] (x = 0; 0.3; 0.5; 0.7). The compounds were melted by rf at T =...

  • Synthesis of a Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] high-temperature superconducting phase with T[sub c][sup °] above 100 K. Tomilo, Zh. M.; Prytkova, N. A.; Gololobov, E. M.; Turtsevich, D. M. // Technical Physics Letters;Jun97, Vol. 23 Issue 6, p422 

    A high-temperature superconductor with the Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] structure and a superconducting transition temperature T[sup º, sub c] = 102-107 K has been synthesized. The synthesis conditions are described and results of a phase analysis, and of resistive and inductive...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics