SYNTHESIS AND SUPERCONDUCTING PROPERTIES OF THE STRONTIUM COPPER OXY-FLUORIDE SR2CUO2F2+DELTA

被引:294
作者
ALMAMOURI, M [1 ]
EDWARDS, PP [1 ]
GREAVES, C [1 ]
SLASKI, M [1 ]
机构
[1] UNIV BIRMINGHAM,SCH PHYS & SPACE RES,BIRMINGHAM B15 2TT,ENGLAND
关键词
D O I
10.1038/369382a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
HIGH-PRESSURE synthesis has proved a useful technique for obtaining new, metastable copper oxide superconductors; for example, oxygen insertion into Sr2CuO3 at 6 GPa (ref. 1) yields superconducting Sr2CUO3.1, with transition temperature T-c = 70 K, in which the superconducting CuO2 layers are generated by pressure-induced oxygen migration from apical to equatorial sites. Although the simple structure and high transition temperatures make this family (general formula Sr-n+1CUnO2n+1+delta) of interest, the stringent synthesis conditions limit its value for applications. Here we report that fluorine insertion into Sr2CuO3 at ambient pressure causes related structural rearrangements to give superconducting Sr2CuO2F2+delta with a maximum T-c of 46 K. In this synthesis, the structural changes previously initiated by the thermodynamic effects of high pressure are induced chemically under ambient conditions. The result is a superconducting oxy-fluoride in which fluorine plays a dominant structural role, rather than merely being an electronic dopant as in La2CuO4Fx (ref. 2) and Nd2CuO4-xFy (ref. 3).
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页码:382 / 384
页数:3
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