THE SUPERCONDUCTING HGBA2CAN-1CUNO2N+2+DELTA HOMOLOGOUS SERIESстатья
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Дата последнего поиска статьи во внешних источниках: 9 ноября 2013 г.
Аннотация:Syntheses, heat-treatments, structures and the superconducting properties of the first four members of the homologous series HgBa2Can-1CunO2n+2+delta are presented and discussed. Syntheses under high pressure seem to yield samples which contain less than 5% impurities. The structural characterization has been carried out by X-ray diffraction, electron microscopy and neutron diffraction. Heat-treatments in oxidizing atmospheres usually increase T(c). The member with n = 2 does not follow this rule because the as-prepared sample (T(c) = 104 K) seems to be overdoped. Heat-treatment in N2 at 250-degrees-C for 10 h induces an increase in T(c) to 123 K. Additional heat treatment under N2 (400-degrees-C, 18 h) decreases T(c) to 110 K. In Hg-1212 superconductivity exists in underdoped and overdoped regions.