THE SUPERCONDUCTING HGBA2CAN-1CUNO2N+2+DELTA HOMOLOGOUS SERIES

被引：25

作者：

MAREZIO, M

ANTIPOV, EV

CAPPONI, JJ

CHAILLOUT, C

LOUREIRO, S

PUTILIN, SN

SANTORO, A

THOLENCE, JL

机构：

[1] AT&T BELL LABS,MURRAY HILL,NJ 07974

[2] MOSCOW MV LOMONOSOV STATE UNIV,DEPT CHEM,119899 MOSCOW,RUSSIA

[3] NATL INST STANDARDS & TECHNOL,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899

[4] UJF,CNRS,CRTBT,F-38042 GRENOBLE 09,FRANCE

来源：

PHYSICA B | 1994年 / 197卷 / 1-4期

关键词：

D O I：

10.1016/0921-4526(94)90258-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页码：570 / 578

页数：9

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