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摘要: 利用低温超高压装置,测量了Hg系样品HgBa2Ca2Cu3O8+y(Hg-1223)超导转变温度Tc在压力作用下的增强效应。压力最高达7.8 GPa,超导起始转变温度常压下为130 K,加压到5.4 GPa时获得最高温度为140 K。在5.4 GPa以下获得dTc/dp为1.85 K/GPa。用压力作用下氧原子位置的改变使载流子浓度提高和CuO2面间的耦合作用来解释高温超导的压力效应。Abstract: The critical temperature Tc of the superconductor HgBa2Ca2Cu3O8+y (Hg-1223) sample is determined by four probe resistivity measurements under quasi-hydrostatic pressure up to 7.8 GPa. Tc increases from 130K at ambient pressure to 141 K under a pressure up to 5.4 GPa. dTc/dp=1.85 K/GPa at pressures below 5.4 GPa. The moving of some oxygen atoms and the coupling between CuO2 planes were used to analyzed the pressure effect on Tc of the high Tc superconductors.
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Key words:
- low temperature /
- high pressure /
- Hg-1223
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