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Anisotropic properties of spherical single crystals of La1.8Sr0.2CuO4-delta
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Department of Physics, Faculty of Sciences, Chiang Mai University, Chiang Mai 50200, Thailand.
Department of Physics, Faculty of Sciences, Chiang Mai University, Chiang Mai 50200, Thailand.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2006 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 439, no 2, 85-92 p.Article in journal (Refereed) Published
Abstract [en]

Single crystals of La1.8Sr0.2CuO4-delta grown by the traveling solvent floating zone method have been ground to spherical shape for studies of anisotropic superconducting properties by SQUID magnetometry. At low enough temperatures and fields, the spheres are perfectly shielding (susceptibility -1.5 [SI]) and thus magnetically isotropic. The field dependence of the critical temperature, the transition width and the field expulsion well below T-c of the two crystals is detailed in this paper. The anisotropy of the first critical field when the applied field is parallel and perpendicular to the c-axis of the crystals amounts to about 3 and is within errorbars independent of temperature for both samples. Magnetization vs. field experiments along principal and intermediate field directions demonstrate the angular dependence of the hysteresis.

Place, publisher, year, edition, pages
2006. Vol. 439, no 2, 85-92 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-26118DOI: 10.1016/j.physc.2006.02.014ISI: 000238491900007OAI: oai:DiVA.org:uu-26118DiVA: diva2:53892
Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2017-12-07Bibliographically approved

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